When I was in kindergarten and had long hair there was a boy who would sneak up behind and pull it and the teacher would not do anything because it was "my word against his". My mother told me to just stomp down hard right behind me next time it happened without waiting to look. I did, and he cried to the teacher... but he never did it again.

Also, LW's mother is sadistically toying with her. It's a power thing. Fuck her.