glad to hear about the reading.
Sad to hear about the school, but it may be a giant step forward if you have isolated the problem that school hasn't yet seen reason to see things as you see them. This is a fairly easy problem to fix. Much better than, we see what you are seeing and still don't care.
I like the idea of making video recordings. If it's simpler to make up or find some work sheets showing what she can do - in her own handwriting, at home, that usually works to.
Try to think of yourself as an investigator - gathering evidence of her 'readiness level.' Sure it would be easier if she were performing at an even level across every subject, but that doesn't seem to be the usual case, does it?
Hopefully the athority figure will come through for you. But if you show him or her work sample, that will help as well, yes?
Love and More Love,
Grinity
