We've heard good things about AOPS, but haven't heard of Davidson Gifted. Will definitely check that out, thanks!
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].