Harley is shown the transforming Joker

“Well you see D-Harley, I want to run tests on you to make sure you’re fully capable of becoming a superhero again. This kind of change isn’t easy. Plus, I’ll have to create a new identity for you, and explain where Dick Grayson went. A cop doesn’t just go missing without proper explanation. It will take a while.” Bruce replied, walking with Harley through the Batcave.

“Thank you Bruce, for using my new name. It’ll take a while for Babsy to get used to it, but she will. And I agree, making new documents won’t be easy, but I already have an idea of what I could do. Plus, I have a new costume idea.” Harley said. “It’ll be like my old one, but fitting of the new me.”

“And about Joker, well, this might take a while.” And so Batman explained the whole situation of what he and Barbara decided to, and by the time it ended Bruce had stopped walking, in front of a big iron door. “And here is where she is now. The process will take much longer, due to Joker’s unique chemical resistance, and his insane mind will try to reject the programming, even with the gas, but soon enough she’ll be complete, and she’ll obey every word we say. What do you think?”