I would have tossed her at the slap. I don't care if she apologized or not. That girl definitely has some issues and if she doesn't learn from it now, it'll only lead to problems later on, as witnessed by the second T.
Obviously though, you do what you feel needs to be done to control the game.

In what way? Positive or negative? I know of a girl on one of our teams who has some anger issues, and a lot of the parents of her teammates would like to see her get whacked for some of her "attitude".