From Wiki on Batman: THe Brave and the Bold Characters list (info gathered from interview):
The should have just played her up sorta like the comic book version and had Batman let her get away after taking the loot. Then Elongated Man and Bronze Tiger could comment about how they think Batman may have a crush on her or something. (or just use the same type of situation that happened in her first appearance in Batman #1).
Also says that Jason Rusch is the version of Firestorm on the show.