I also have an artistic, high-achieving daughter. Academics are her primary reason for wanting to go to boarding school, so although she investigated the arts opportunities at various schools, they weren’t really a deciding factor. We checked out vocal music, theater, and visual arts…didn’t look into dance, and assumed writing instruction would be good anywhere. We didn’t find a single school really lacking, although obviously some have unique programs. She did like Loomis and SAS very much. If ceramics is your daughter’s particular interest, I believe there is a strong program at Mercersburg (my children’s school). Also, Choate has an arts concentration that may be of interest. Arts high schools are pre-professional, for kids who only want to do one thing and who know it at a young age. IMO, your daughter is wise to want a general education. Best of luck in your search!