Book about 12 year old girl with leukemia?

She might be older or younger. Her favorite song is The Lion Sleeps Tonight. She has dreams during her chemo threament and during them she is in africa i think i can't remember it might be just a play but i thought they said it was a book to. Any ways if you can tell me the name of the book or the play that... show more She might be older or younger. Her favorite song is The Lion Sleeps Tonight. She has dreams during her chemo threament and during them she is in africa i think i can't remember it might be just a play but i thought they said it was a book to. Any ways if you can tell me the name of the book or the play that would be great thanks!!
Update: OH and she dies in the end
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