Keystone National is a reasonable choice. However, another school to consider is
Laurel Springs School where they specialize in students like your daughter. They have many, many students who are dancers, athletes, performers, and so on. Former students have gone on to bigger and better things.
While I do know of Bradenton Prep, I have no information on it and you are the first to ask about it. That means little, but it is something to consider.
My best advice is to call the schools in which you are interested. Sometimes that personal contact gives you much information.
Tom Nixon