You can go to the principal (and if no action is taken, then the school board), and demand that an IEP (Individual Education Plan) be put in place for your daughter. The school must pay for any testing, and provide an appropriate level of education for your daughter. And IEP Team is put together, and while one person may say that it’s not developmentally appropriate, there are others who will also be evaluating the situation. The school does NOT have an option to deny you this.
Additionally, I would suggest talking with your daughter’s math teacher specifically, requesting enrichment activities (all teachers are taught how to mainstream gifted and talented students, and teachers textbooks provide enrichment activities for them to use) for your daughter. If she is as advanced as you say, the math teacher will most likely also be recommending putting her in an advanced class. Teachers don’t want to see kids become bored.
Good luck!
That might not work because IEP’s are documents that are mandated by the federal government to help with the educational needs of children with disablities, not ones who are gifted. Your idea of asking for testing is a good one, but I can guarentee the school district will probably drag it’s feet at accommodating the parent in this request.