If I was gonna do one on her, it's unfortunate (and I don't think I have the pages handy) but I'd use the sequence where she's listening to Bats losing a fight and disobeys orders to jump in. It's the official excuse for her firing, but to me it's everything that's best about Steph - it's all right there on her face, she can't sit back and wait when she knows someone's in trouble, she has to help.
But then Bats goes and ruins it with the punch line!