Mixed feelings. On the one hand, it's a great, heartwarming story of a girl finally understanding herself and overcoming her learning disability. OTOH, how was this missed, by everyone, until sixth grade, and caught by a long-term sub who only just met her? 
 This is going to be all over reading lists and award lists, in the same way that Wonder and Because of Mr Terupt were. 
 Not bad, and I'll certainly have students who will love this, but my feelings are not overwhelmingly positive.