It's difficult for me to assign ratings to books like this. It's a solid book for pre-teen girls. I must've read it a long time ago, because I totally remember the "I must, I must, I must increase my bust!" business, but I read it again recently, in the interest of being well-informed about the "classics" in children's literature.
Margaret's family is Jewish, she hasn't yet decided, and she's just, you know. She's just trying to grow up, in a new town, with new friends. Blah blah blah periods.