From what I recall It was Tabitha's unknown twin sister Josette who was put into a monastery instead of killing as per the Gallian tradition of killing one twin who inherited the void in canon not Joseph's daughter Isabella.
The Pope later used Josette to replace Tabitha who had become Queen of Gallia and impersonate her as apart his greater plans.
Yeah, Josette inherited the Mind of God and became a puppet of the Pope, who used her to coup Tabitha.
Which in this set-up seems less like something Louise would be interested in dealing with, and more like an issue for Gramont Adventuring Concern Inc. (monmon-owned patent pending). Speaking of...
***
Brand Infringement
The party stood in silence, clothing tattered and stained by their narrow escape from the
Grande Garrison de Gallia - not to be mistaken for the
Petit Palace de Parie, much less the
Moyenne Moat de Marsaye. The alleyway was safe, for the time being - safe enough to catch their breath, to regroup, and to await word of the safe haven that must, surely, be waiting for them soon. It was a silence punctuated by pained hisses and hushed groans, a silence laden and heavy with expectant glances levelled at the group's deadliest fighter.
"Zere eez somesing I must tell you all", the wind mage murmured at last. "Somesing I have not told anuzzer soul. Anuzzer, currently living, human, soul. At my birth, zere were... complications. Matters zat were decided to be kept secret. I-"
"You have a twin."
There was a moment's pause before Guiche threw up his hands.
"Kirche? Please! Tabitha was
expositing! You
know how rare it is for her to open up, even with the application of very specific qualifiers. We should be encouraging her to use her own words! Please continue, Tabitha."
"Non, non", she said, her expression totally unchanged yet somehow conveying a deep sulkiness. "Kirche eez correct. I 'ave a twin sister. Her name eez Josette. Eet eez she who sits on ze throne of Gallia, bearing my name and wearing ze crown I never wanted."
"
Thank you, Tabitha", said Guiche. "I am
very glad you decided to share this part of your life with us-"
"But your name isn't Charlotte?" asked Danny.
"-and I hope that you will feel empowered to further trust and emotionally engage with us in future, regardless of how
insensitive certain party members are being right now."
"Oh, come on", Kirche scoffed. "It was obvious from the moment she showed up on the throne. Evil twins pop up all the time, especially in royalty. She looks just like Tabitha, but acts the complete opposite. Hells, she even recruited
our evil opposites. She hasn't got a Danny,
yet, but there's that blonde Papal prettyboy swordsman, the obviously powerful confidante with an amazing figure and great taste in translucent dresses, and that scheming forehead girl with the greedy eyes."
Privately, Guiche offered a prayer of thanks that Montmorency had gone ahead to secure trustworthy lodging. Much like back-alley surgery, black market bartering could take some time, and was seldom pleasant to watch.
Plus, Kirche was being unkind. Isabella's gaze wasn't
greedy, just... occasionally aimed in two directions at once.
"I guess I can see why she was hidden away", said Danny. "If the queen gave birth to twins, and one was good but the other was evil... they'd want to hide that, right? To avoid a scandal?"
Tabitha considered this for a moment.
"Oui. An evil twin and a good twin were born zat night, and Josette was sent away to a monastery."
"So now she's back... and you have an evil twin..."
"I do 'ave a twin, oui."
"Then our path is clear!" Guiche raised one hand, finger pointed boldly forward at nothing in particular. Tabitha wondered if he was still slightly concussed. "We must depose this foul imposter - who, it now occurs to me, is actually a totally legitimate heir herself with the apparent blessing of the Pope, but
nevertheless - we must depose
and expose this foul imposter, scatter her cheap imitations to the winds, and see our dearest friend seated in her rightful place as Queen Charlotte the I assume First, whereupon... medals and titles and feasts and such. To be provided by the newly-instated monarch at her discretion, of course. Bit odd for an adventurer to be issuing her own reward, but there must be precedent-"
"Non. We should leave."
Guiche and Danny stared. Kirche raised her hand. "All in favour, say aye."
"I do not want ze crown", Tabitha said, simply. "I do not care about ze throne. I do not care about
Gallia. My sister eez une pauvre conne, but she eez welcome to all zis. My uncle eez dead, and with him my only reason to remain at all."
"You must have cared about him a lot", said Danny, sadly.
"Thoughts of 'is final moments 'ave often intruded on my sleep, zeese last few nights."
"Oh no! But I thought you were sleeping so much better! You even woke up smiling yesterday-"
"But- but be that as it may", Guiche sputtered, "Tabitha, I can't just leave this country in the grip of an evil tyrant! Er. Again, I mean. Even if you don't wish to take the throne, surely there's a trustworthy... well, not a
vizier, obviously, but some kind of regent?"
"Ze next in line would be Isabella. My cousin."
"Well, perfect! We'll form an underground rebellion with her as an insider, rally the people and the true loyalists with a few stunning victories and a well-timed public relations campaign, and be home by the Silver Pentecost!"
"She eez also evil."
"No, no, she's a nice girl deep down, I'm sure of it! And she seemed deeply conflicted about her role in all this. I know you two don't have the best relationship, but we spent a lot of time alone, talking together. We've even been exchanging letters, and I know there's good in her! All she needs is a friendly ear and a willing shoulder to-"
"And who,
exactly, are you talking about?"
The voice from the alley's entrance was sweet as honey, and had the same general association with an arsenal of painful venomous stings. In Guiche, it evoked a Pavlovian response - which is to say, he deflated like an underbaked meringue.
Kirche stepped in with a helpful grin. "Tabitha's cousin". She helped some more. "The evil you".
Montmorency glared at her fiancé, one set of ringlets and several sets of patience utterly undone by the day's unexpected exertions.
"Guiche. We have spoken about this."
"Yes."
"I've acknowledged that many villains hold the possibility of redemption, which we as heroes must champion."
"Yes."
"And
you've acknowledged that a lot of the villains you try to redeem are pretty young women."
"Yes, but-"
"And we've discussed, Guiche, the healthy boundaries around this kind of behaviour."
"Yes, but under the circumstances-"
"What circumstances, love?"
"Well, she's-" Guiche flailed for adjectives like a blind man in an armoury, hastily discarding words like 'complicated' and 'different' as the hiltless blades they were. "As Kirche says. She reminds me a little bit of you, in a way. Before... before
us, I mean. Caught in unfair family circumstances. Forced to match terrible pressures. How could I not help?"
As far as gambits went, Kirche thought, it was pretty risky. A solid placating feint, and he'd avoided a disastrous diamond analogy in the bit about pressure, but there was still serious room to backfire. Would this maneouvre win the defending champion the breathing room he needed to survive the round, or would 'I only pursued her because she looks so much like you, my real true love' prove as flimsy a defence as it did in the great Von Zerbst Uncivil Proceedings Of 864? Odds in, bets locked, and-
"We'll talk about this later", Montmorency sighed. And there's the bell, it's a bloodless victory by timeout! The crowd is on its feet! "When I've had a bath. And you've had a cold shower."
"And Tabitha's got Sylpheed out of the sewers", Danny added.
"And they've both had
two showers", Kirche noted.
"And then, and only then, will Tabitha tell us about her cousin's tragic past. Focusing, preferably, on any details that indicate
exactly how well she's likely to reward anyone who can make her Isabella the First."
Tabitha nodded.
"You do not need to worry. Guiche eez faithful. Ee is not interested in Isabella like zat."
Montmorency's gaze turned to Tabitha, softening with surprise. A comforting word was rare from her - any kind of word was rare from her, in fact, but intentional comfort was a particularly lesser-spotted species.
"Ee did not do anyzing even when she locked 'im up in her boudoir and 'ad her maids prepare ze special lingerie-"