We do use protective gear, but we are coming up to a fight, so she doesn't want to wear it. But, I think she might have a very hard skull or something, cause she has knocked her head a few times at school hard, and not had any symptoms, she has run into glass windows and doors and cracked/broken the glass and she has been fine. She is a very tough person, even when she breaks bones, she doesn't feel it until one of us, her friends spots it. She also wears shorts and shirts in freezing weather while we are all standing around in long shirts and track pants. Is she just tough or is they something else that might be wrong. We are kinda worried.