Yes. And this Mab likely was "shaped" by Mother Winter. And took the belief that such shaping of subordinates is within remit of higher Winter hierarchs from the experience.
I dont believe there's enough evidence to advance this as a theory.
All we know about her earlier life is that she and Titania are twins, that she had a thing with Merlin, and she was Winter Lady for the previous Mab.
She didn't say "I don't trust you". She said "I will never trust you". Mab knows Mab's mind. Mab cant' lie. Even and especially to herself. Mab told Dresden that she will never trust him. Not that "she won't trust him until he's absolutely and unquestionably proves his loyalty" not that "she won't trust him until he's her fully soul and mind bound slave". Never. Period. Mab is incapable of trusting Dresden. It is safe to extrapolate that outside of maybe Mother Winter and Uriel, she is incapable of trusting others period.
And this is why she can't be dealt with in good faith. Because she will always deal with others with full expectation of betrayal. Will always coach her deals in terms that protect and benefit her when she is betrayed. There will always be a knife prepared to stab us when and if we deal with her. In order to be able to trust Mab, one has to know that she can trust them in turn. Otherwise, it just doesn't work. And she can't trust others, period.
1)Mab cannot knowingly tell a lie. But Mab is not immutable. Mab is not unchangeable. Mab does not know the future. The fact that she says "I will never trust you" can be her sincerely held belief in Ghost Story, and her opinion can changes in a day, or a month, or a year by the time of Cold Days as her assessment of you changes.
Or even just conditions change.
As we see in canon, where literally her first task to Dresden in Cold Days, the next book, is to entrust him with assassinating her daughter and where she steps onto Demonreach with him there.
Or in Battlegrounds, where she trusts him with her life and strategy.
2)Being prepared for betrayal =/= Not be dealt with in good faith.
Thats like saying that you cant deal with banks in good faith because they demand collateral for loans and have procedures for attempting to recover money from defaulters.
Furthermore?
This is the Dresdenverse; breaking a deal, a promise, a contract with a magical Power gives them power over you.
You dont want to give Mab power over you after trying to cheat her.
3)Except literally everyone else that does.
Dresden trusted her to keep her word about his debt, and to give him information about the Kemmlerites. The White Council trusted her word about their getting safe passage through the Ways of Winter in the middle of a war. And so on.
This is Mab. Not the Red Court of Vampires. Not the Denarians.
Her word is good.
That's not quite correct. Mantles are not absolute. You can, and, I believe, are supposed to fight against them, while cooperating in things that matter. Mab lost that fight long ago.
Not actually true.
Mother Winter makes it clear in Cold Days that Mab has agency and free will even within the constraints of Winter Law, and exercises them. It might not look so from the outside, but Fae dont work the way vanilla mortals do.
Kind of... Mechanically Isabela has academics 2 which would put her at College level, but it is not in fields American High Schools recognize as important, things like an encyclopedic knowledge of the history of the Roman Empire, up to and including part of it modern historiography does not recognize because the source is 'I was there', being able to describe in detail the campaigns of Alexander the Great and offer a analyses on them that would impress a military historian or a creepily detailed understanding of how plagues spread historically and nowadays.
You have to keep in mind these people are vampires, they do not see themselves as part of human society, it would be psychologically unhealthy to engender a feeling of kinship to the the ones they must prey on.
-Most of that will qualify her for something like an International Baccalaureate I think.
Its nonstandard curriculum, but its still enough to pass high school requirements. She really shouldnt be in a lower grade.
And fudging her age would have been more trouble than its worth.
-Most of them still live in and navigate mortal society. They have to do so, since Whampires are the social ones.
Madrigal Raith is a movie director.
The Malvora who was killed in Jury Duty was a stockbroker, Tania Raith worked in the DA's office after graduating college in her early 20s, and Connie Barrowhill was in college when we first met her pre-fledging.
My impression of Bella's scholarship as portrayed is that it appears to be more of an anomaly than the norm.
You claimed that her mentor is propably of Roman age.
And even if he isn't quite that, he's definitly old, powerful and a relative outsider among his court.
I can totally see him having different priorities than modern tutors and if you let your daughter be mentored by an ancient monster, then you should let him do his thing with minimal interference.
I would not fault her father.
Thats why my point of comparison was children working fulltime in entertainment and sports.
Children actors and athletes spend full days working and still have time to keep up with a modified academic schedule.
Being a teacher on a film set is like trying to teach math in the middle of a big, loud, 10-hour cocktail party
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3 hours a day in California by statute.
There was literally no reason I can think of that even fulltime mentorship by a vampire elder should have been exclusive with enough private tutoring to maintain age-appropriate modern scholarship.
Especially since some of the subjects, like Literature and History and Foreign Languages, share some overlap.
And this wasnt fulltime; if he's a troubleshooter for the Skavis, he's often going to be away in places doing things where a 6-16 year old scion tagging along would have been inconvenient at best.
Hence I dont blame this on Leinth. Her family fucked up.