Dance at Conn, Denison and Bryn Mawr is much more modern-focused, not ballet. There may be limited options for a trained classical dancer there. We know kids who did summer dance program at Bates in Maine, but I think that is also modern-contemporary focused, not ballet.
Dickinson has a relationship with the Central PA ballet company, and someone had posted recently, I think on the Dickinson board, asking about that. Those are all test optional schools.