^I would be willing to bet that's exactly what happened.
I'm really wondering what the heck Didio's vendetta against Stephanie is. It's like nobody is even allowed to mention her.
It's not a vendetta. He is following his editorial philosophy that dictates for well known comic properties only the most well known versions should be kept around and the lesser well known version should be either dumped into limbo or killed off or given some other role.
It's why he wanted Nightwing killed off in Infinite Crisis. He felt his evolution away from Robin was a mistake. The same for Wally West as Flash and Kyle as Green Lantern.