How to persuade parents to let u play hockey

I want to play hockey I'm a 13 yr old girl and Im pretty tough to play bantam.  I want to play so badly, but the moneys no prob. Its just that my mom says It's dangerous but I spar. I just want to play one more year. I played in the Atom league. I cann't persuade them though it so sad:( Please help I need answers quickly!!!!!!! help me persuade