If she was being teased and didnt like it she should have walked away. If she swung first and it sounds like she did, she should be grounded. Letting her know that there is no consequence for trying to solve a problem with violence is not OK in my opinion.
I have a 13 year old son who got in his first fight this last fall. It was not that bad, he had a couple of small cuts on his face and so did the other kid. Overall it was one of those things where kidding around went too far (game of mercy). My son and him were and still are friends to this day. What sucks is this happened in the hallway between classes. Once the fight was broken up the police were called and school was stopped while the officer conducted an investigation and interviewed witnesses. At the end of the incident his report was inconclusive because 30 kids gave 30 different stories. My son was suspended for 6 days and I grounded his ass on top of it.
Not criticizing your parenting skills. Just giving my opinion
