It makes me really really angry that they are having bright children repeat math they already know.

Don't necessarily throw away the ADD/ADD-in comment. Who knows what's going on in that classroom. I guess I would find out if you could even have ADD with a processing score that is that incredibly high. I don't know how they interact. Once your child gets in a better fit classroom, that will be a better time to consider if their might possibly be any truth to that comment. Girls are tricky.