I know they hate that term on this site, where people tilt left like a sailboat in a tornado. But no other term will do. Kate IS a difficult woman; to say she has just been wronged by men is to disempower her, to deprive her of agency. She is a woman of cleverness and talent who has become narcissistic, self-indulgent and cruel, and is torturing her poor sister. Making a powerful female character into a mere victim may seem like it is sympathetic, but it actually makes her much less interesting.