Nora herself did many strange and twisted things that gave rise to the idea that she was actually in love with the Joker, but had to split up working with him after she got summarily bitch slapped by Duela Dent (it was a Wednesday - on Wednesday's she's the Joker's daughter) for trying to hit on her dear old papa. Nora's next partner in crime, after a short stint with a man known only as Billy "Lol Blondz" Arrowsmith, was Catwoman, before the two of them encountered Batgirl. Batgirl didn't take kindly to a bunch of other women on her turf, stealing the men she was working so hard to seduce, and so she scared off Catwoman and flushed Nora down the toilet.