Title of children's novel? ballet dancer with leukemia?

Anyone know the title of a children's novel about a girl who takes ballet classes and wants to be a dancer but has leukemia. I think her mother was famous or just rich. In hospital she makes friends with another girl with leukemia and visits her, talking off her wig before going into her house since her friend... show more Anyone know the title of a children's novel about a girl who takes ballet classes and wants to be a dancer but has leukemia. I think her mother was famous or just rich. In hospital she makes friends with another girl with leukemia and visits her, talking off her wig before going into her house since her friend can't afford one. She idolizes Darcy Bussell and has a photo of her which gets destroyed.
Thanks.
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