Is the school going off of the PSSA? Unfortunately, I don't think that the PSSA Proficient would get you very far in some districts. I just looked up our district 8th grade results from last year, and 93% were proficient or higher (advanced) in reading, 95% in math. If your district is similar, then almost all kids show mastery and you need some other measure by which to show your child needs something more.

How did she get originally get the GIEP? Our district requires you to have 130+ FSIQ on the IQ test of their choosing. While I realize that this doesn't really comply with the state standards, I was just wondering how they initially IDed your daughter. Maybe there is something in the original testing/ID that you could use?