So I told her dad what I told my son and he gets all pissy saying no boy should ever hit a girl. Bla bla bla. Keep in mind, I told my son not to hit her in the face or hit her hard. Just enough to get her to leave him alone.
To add, I have told her to stop. She stops for a while then does it again another time. She says she is just playing but my DS says its rough and gets on his nerves. We've talked to the girl but I can't watch over them every second.