At least subject acceleration sounds warranted. I wouldn't expect grade level GT classes to meet her needs as she sounds ready for much more in language arts at least. My dd isn't nearly as advanced in math as she is other areas, but she's still done well with a grade skip.

I might keep pushing for a skip in the back of your mind still. Good luck. I hope that you get more than, 'we have lots of gifted kids like her' from the school.

Study Strategies for Accelerated Learners