I fellow boarder of mine, was kicked in the head a few years ago. She's had extensive surgery to better this injury, though it still causes her pain.
I think she's also being stubborn, but she doesn't want to wear a helmet. At our barn, it's a rule that you must have a helmet, or you aren't allowed to ride.
Does anyone know of anything that might make it more comfortable for her to ride? She says helmets are very uncomfortable