Scans_Daily

Earth-2 works for me well. She's a socialite (so in the same circles as Bruce Wayne, with the parallels there) in an abusive relation, leaves him and breaks into his vault to steal his valuable jewels as she goes, and finds she's gained a taste for the experience.

Or the Batman Returns one, where she's a loyal corporate type, finds a nasty secret from her boss, is betrayed and almost killed by him, and something snaps and she embraces a mentality almost 180 from her old, being an untethered and free like her cats.