Originally Posted by Justice Bringer
I'd say introduce her in perhaps the 4th film when Jason is a teenager.
It would be remincent of the Kon-El and Supergirl days.
Hopefully by then Nolan would have decided to bring in Dick Grayson too.
Nah, I say that Supes really wanted a daughter, so he uses his heat vision to perform an impromptu sex change operation on Jason, also renaming him Kara.
And presto, Supergirl has arrived.