|Medieval lady, a photo by Oneras on Flickr.|
Her favorite tactics are blackmail and manipulation by guilt. She does a lovely job of pretending to be generous, sweet, and innocent when necessary, then she turns right around and stabs her claws into the softest flesh she can find. She holds things over her enemies' heads, things they would rather forget and have kept secret--affairs, gambling debts, family scandals--threatening what they hold most dear in return for special services.
For years she put up with her husband, asserting her superior intellect whenever possible and making him look like an incompetent buffoon to everyone, but after a decade or so she grows quite tired of the game. She isn't content with a mediocre castle on a mediocre estate in a mediocre county; she wants a larger game to play.