>> As it is, my child is coming to the conclusion that school is boring/easy

And she may feel that way even in gifted classes, I know I did. There's only so much that teachers can do. If it's so easy then she can spend her time doing/studying other things that she likes.

I read all the feynman lectures in middle school classes (ymmv with teachers). Later I got into quantem mechanics and advanced math, all on my own and because I had a bunch of free time..

Those were some of my favorite years and shaped who I am today. There's plenty to learn beyond the school curriculum and your child can self direct it