But Gotham Girl... Idk. I don't know how I feel about a Supergirl like person in the batfamily. I like how even though most of them are all just regular humans they mange to do crazy epic stuff but Gotham Girl is powerful so now if you include her you have to come up with a reason why she gets taken down (Like They Do With Superman Alot) cause she alone could end the most threats qucikly.
Deathstroke's In Town? Gotham Girl.
Shiva Shows Up? Gotham Girl
Joker Barricades himself in a building? Gotham Girl Flys in And Rips him out.