Back in the Silver Age, a woman named Kathy Kane was Batwoman and her niece Betty Kane was the original Batgirl, so that Batman & Robin would have female equivalents and the fancy millionaire spending all of his time with a prepubescent boy would be a little less creepy.
In the Modern Age, Barbara Gordon was the first Batgirl. Bette Kane was introduced later as another teen hero named Flamebird. Finally, Kate Kane was introduced as Batwoman during 52. It had been pretty much understood that Kate & Bette were just the modern re-interpretations of the Silver Age Kathy & Betty. Now it looks like Grant Morrison’s claiming that the Silver Age Kathy Kane exists in Modern continuity and was also at some point Batwoman. I don’t understand this man’s obsession with incorporating the Silver and Modern Ages, but it’s starting to get pointlessly stupid.
