[X] Piety
Was thinking Martial, but hindsight... Eh, may as well go with the 'natural high' cap, and build from there say...
And in arbitrary order...
[ ] Martial, given her nature as a Doll, and our Golems as is... Might, actually develop/grow to become an amplifier, if one thinks of her threat to 'blow herself up' not help with Human tanks tier escalation. However, stat wise alone, she... Isn't the best. Though that could be countered by later trait development, Golem/Doll advancement, est.
... Think, her potentially becoming 'mother hen' for our Living Dolls, say? And that Ruby plushie...
[ ] Stewardship
At risk of going 'hur manager', Stewardship is... Hindsight, not 'that' needed, unless we want to think of having a 'pretty face' be our Manager/business accountant, and be the 'public' face of our more... 'public' venures. However, I don't think it'd be as much a 'strength' for the Dollmaster, compared to say, Martial or Piety.
[ ] Diplomacy
Hindsight, on an 'off' focus, Diplomacy could be a bit better for the Dollmaster. However, focus/deck of hands wise... I've a feeling, it 'miight' be better to see on acquiring a Magical Girl for a Diplomacy adviser, modern times et all, ditto for Ninja. (And don't get me started on the Dollmaster's joke Intrigue, that's the inverse of the Ebon Lord's bad diplomacy.
And lastly...
[ ] Piety
Holy cow, at a natural high base, plus bonuses leading to an advantage on piety... If going "High stat" focus, she'd have us beat on Piety. And on risk/reward bonus, no need to focus/gamble on getting a risky 'corruptable/dark mage' as a Piety adviser, and one can argue that she could be the best lore source to find out/learn about what the original/'true' Black Kingdom and it's history is like from a personal perspective, and craft an ideal to make an even better, updated/modern Black Kingdom to adapt to the times, to save the Ebon Emperor.
However, only bane is hindsight, one must account to this question: would Piety in a sense, 'truely' be the best field we can have our Doll under? When given her possible experience on commanding Dolls, which in hindsight could blend in well to our current forces of Shadow Stalkers and Golems, especially golems...
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Pragmatically, I see only two fields we can put the Dollmaster under. Mainly,
Martial, & Piety.
Martial for that 'Doll Leader' bonus trait, potentially later on. (Though that may lock out a later good general, X Com base wise, say. Or Knight/Martial Magical Girl unit, say.)
While Piety, could go well with both learning on some of the olde style of Ebon magic/piety, and other esoteric fields that could really complement our Golems, and increase our own Piety stat over time, with training... It'd be even more hilarious, if she thinks/concludes that our 'natural low' Piety/Mana stat, may have helped ensure a lack of being traceable... Which, given the times, might be for the best, cover wise.
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And last/last, I'm guessing Caleb? May have likely been a relative, if we picked a more noble background, last name wise. But alas, due to said background not being chosen/est, and likely suffered a background defeat/death... Well, tragic.