Couldn't you have her tested on your own (if financially able) and have those test results to use if needed? We chose to have our DD8 tested (at our expense) when she was 6 to rule out the different diagnosis the school was just throwing out there in an attempt to explain her behaviors. It ended up that she was just very bored in class. The testing was the best thing we ever did and the best money spent. It proved to us we really did know our daughter and erased any doubts we may have had about how bright she is. We kept our results to ourselves until we had to prove to the school she is really at the level she is at. If having your daughter tested forced your school to do their own testing what would that hurt other than being out the cost of your individual evaluation? I think the test results would ease your worry - I think sometimes it is not knowing for sure that is the hardest!
I also don't know how your state or school district works, but in some states if a parent requests an evaluation then the school has a set time to respond to that request. If they come back and say they don't see a need for testing then you can provide your test results showing there is a need. Just some thoughts!
We are fighting our own battle, but I know for a fact that having DD tested and proving to the school she has a need for accommodations is the only reason we are getting a GIEP this week!
