Extraordinary by Miriam Spitzer Franklin is about Pansy trying to come to terms with her best friend's sudden brain damage from meningitis contracted at camp. Pansy was supposed to go too but she chickened out. And now she's feeling like Anna's illness is her fault.
Anna can no longer walk and she has seizures sometimes. Pansy learns that her friend will be going through brain surgery to help control the seizures. She naively believes the surgery will "fix" her friend and return things back to how they were before camp.
Pansy does eventually come to accept the new reality of her best friend's life. But it comes after pages and pages of her playing the martyr and / or whinging about how terrible it is to have a brain damaged friend. It's not until the very end that Anna ascerts herself that Pansy really seems at all interested in being friends with Anna as she is now.