If she qualifies you want to get an IEP. They are backed up more in regards to the school having to follow the regulations in it. 504s are not supported as much. I don't believe 504s are funded whereas IEPs are.

If your school wont work with you then find an advocate in your area. When advocates get involved the schools know they are working with someone who will require them to do what they are by law supposed to do.

Good luck.