I don't know. I'm sure that was a factor, but I doubt it was the only one. And Didio was really hardcore on keeping the heroes young, so I'm sure she would have been deaged at least when the new 52 came long. On Babs specifically Didio once said something along the lines of "writers think of Barbara as being in their thirties while in editorial think of her as late teens". (Funny thing is, I don't think Barbara ever was a teen in the comics.)