@Much2learn, upon clarification, OP said that at this point Math was her initial focus. Congrats to your daughter as it sounds like she picked a great path, but one’s path is the one that is best for them. The desire to accelerate one’s studies has little to do with whether one is an advanced student - it’s a personal choice.
A sudent-athlete may decide to be a Math major at a top-LAC or a university and then pursue a MS at MIT thereafter, or one may decide to double major in Math and CS with a minor in Philosophy at a LAC before pursuing a MS, or one may decide to double major in Math and Music with a minor in CS - there are lots of paths to take to a MS.