Suggest Treatment For Baldness In A Girl

Hello my daughter is 12 and I found a small bald spot at the top of her head and recently She was in a play so I had to curl and braid her hair with lots of hairspray everyday for 10 days I stopped and found this spot on the front top of her head and She does stress a lot she s worried She will loose all her hair because her dad and grandpa did loose their hair in the same way what do I do????