I see nothing wrong with this the girl is knowingly competing against a boy. Lots of boys get ragdolled by others boys in wrestling matches she didn't do any worse. Just because this boy beat her doesn't mean she didn't beat a boy in another match. At the lower weight classes before puberty kicks in they can be fairly competitive with the boys. Luckily there are more all girls teams and opportunities for them as they get older now. But if a girl wants to wrestle the boys I think she should be allowed to do that.