She’s a 10 but talks incessantly about the merits of agnatic-cognatic gavelkind succession laws at every party

That's an 11

She'd be an 11 if she talked about ultimogeniture

She’s a Crusader Kings player then? Awesome! Got break those estates up come hell or high water dammit! (I’ve been on a ck2 kick the last week. The Wendish empire stands!)