[quote=@Hound55]I don't think that's actually accurate.  Gail Simone did a ton of character work with Oracle. 

When the New 52 rolled around editorial wanted to undo all of that along with the character development Simone herself did on Birds of Prey.  Simone's options were basically let this happen under someone else's watch.... or try and control the damage herself. 

Personally, the better option probably would have been to leave the book in disgust and then when Babs book got panned, then ride a similar wave of sentiment for the old Barbara and have her get brought back with Wally West and the OG Superman...but it's hard to blame her for not knowing it was a possibility. 
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Not only that, but Killing Joke was never actually erased, which was easily viable for Simone to do if she was so adamant about it being so harmful in the grand scheme of Barbara's in-universe history. In Simone's origin issue, [i]Batgirl #0[/i], the story ends on the night in question when The Joker shows up to her doorstep. I don't think Simone really had much of an influence on the decision to turn Babs into Batgirl again, especially since she seemed to kinda not enjoy writing that book compared to how she wrote Barbara in the past.