Okay, there's a trope where something happens to a woman's husband/fiance/boyfriend/significant other/cactus, and she immediately becomes extremely badass (or tries to). Unlike I Have Got Your Wife
, aside from the obvious reverse, the husband is usually dead and the woman is usually either trying to avenge his death or finish his work. Usually, the woman was also badass before she got a boyfriend/married, but she tries to put it aside for a happy homelife.
I'm thinking Naomi Misora from Death Note
and The Bloodied Bride from Kill Bill
I have no idea for a name for it.