Have you heard of https://www.davidsongifted.org/ ? They will help lobby the school system, or help you find other resources. And also get your kid connected with other kids that are intellectual peers as well as age peers. Also, for math specifically, check out https://artofproblemsolving.com/
We eventually home-schooled. At some point, you look at all the time you spend lobbying school administrators and selling band candy, and decide it takes less time to just home school.
Just wanted to add my recommendation for checking into Davidson as well.
They offered a summer academy that hopefully will start back up again after covid and also have an online program that may be a good alternative to full home-schooling if you were considering going that route.
Update: Beast Academy is wonderful. AOPS is great too. Both very good suggestions. Your daughter may also like the math content produced by Poh Shen Loh [1].
We eventually home-schooled. At some point, you look at all the time you spend lobbying school administrators and selling band candy, and decide it takes less time to just home school.