I don't mean she's the Earth-2 Babs, but she is the police commissioner's daughter and she is basically Earth-2's equivalent. (If Earth-2 had a Babs, she lived at a time when women wouldn't have thought of doing that and might have died a spinster librarian)
We all know here just how popular Babs was in the 70s, and this was DC's try at creating a somewhat different one. And possibly preventing another company from coming up with it too.