I admit that I have this what-if paranoia in the back of my mind--"What if she hates it, and years from now is always saying 'My parents pulled me out of this great, relaxed arts school and put me in this hypercompetitive gifted school, and I hated it'?"
Sigh.
Having done this at that age - we always tell other kids switching schools but not "moving" means you end up with MORE friends.
This is a GREAT way to approach it with her, although I know what she will also say in response: "But we never see (best friend from 3yo preschool class who doesn't even remember DD anymore) or (child with extremely weird and hostile parents who left current school in a cloud of ill-will) anymore."