My friend is having a birthday coming up and i have no idea what to by for her any help?

She's turning 11 and we're gonna go bowling, but i don't know what to buy for her. She likes playing the piano, knitting, crocheting, acting, singing. and i can't think of much more. She hates getting clothes as a b-day present so no clothes please! but anyways, just something that you guys think she will like. it doesn't have to be related to any of her hobbies just something girly!! :D Thanx!! :)