Story goes that BftC was going to be a 6-8 issue miniseries. Originally it was written by Judd Winnik. But he was told to cut it down until finally it was down to 3 issues and was given to Tony Daniel to finish writing and draw. What is left of judds BftC (ie part two) is going into batman which Winnik is writing. So...not so much tony forgot her but winnik did. She is going to appear in gotham sirens tho, which I think tony alluded to on his blog.