I don't know but I know what it feels like to do maths witha group about 10 levels below you. It is stressful and I was an adult being paid to be there.

I think I would try and get testing and independant comprehension testing. If you have proof their is comprehension just not writing it would be easier to argue. If you have proof of comprehension and a 2e diagnosis then she should get accomodations.

Unfortunately it sounds like normal craziness in schools.