EVA by Peter Dickinson
Eva's parents are scientists, who work with chimpanzees. After a terrible car accident, they decide to save Eva by placing her brain in the body of a chimpanzee. Eva doesn't know what has happened when she first awakes. How she discovers the truth, copes with it, and eventually decides what to do with her life is a fantasic story. I highly recommend it. It is a great book for discussion!
I have to give credit to my junior high librarian for introducing me to this book. Every so often, she would read part of a book to us over the intercom system and end at a suspenseful part of the book. This was one of the books she read. I don't know that I would have ever discovered this book without her introduction.