@zenmindmom I highly recommend that you join the Facebook groups „Dance Parents: College Bound“ and „Parents of Pre-Professional Ballet Dancers“
There is a wealth of information and wonderfully supportive parents in those groups.
As a dance mom whose DD (current college student) also lived and breathed dance in 9th grade, here is my short list:
St. Paul’s in NH, but I recommend researching where their dancers end up. While it’s a great concept, I am not sure how successful their graduates have been.
LaGuardia Performing Arts School has produced some amazing dancers, but you would have to establish residency in NYC. They only accept applications for 9th and 10th grade. Audition Overview - Admissions - Fiorello H. LaGuardia High School of Music & Art and Performing Arts
University of North Carolina School of the Arts offers a high school program with focus on ballet or contemporary.
She could also audition for a preprofessional division of a major company (ABT, NYCB) during a summer intensive. It would involve online school in the latter years. For a brick and mortar school in NYC, the Avenues School is more academically rigorous than the Children’s Professional School. We seriously explored this option.
Contemporary Companies like Complexions and some colleges with highly competitive dance programs like Berklee, Oklahoma University also have summer dance intensives.
Unfortunately, the schedules and athletic requirements of many private college prep schools do not allow for concurrent intensive preprofessional dance training. My DD was fortunate enough to continue intense training thru 9th grade because of the hybrid schooling during the pandemic. In 10th grade, the academic rigor and injuries forced a decision. While she still danced regularly, she focused more on academics and high school ec‘s. She applied and was accepted to college dance programs, but chose instead a more traditional academic path, takes dance classes and is part of a college dance company.
From what I have observed, professional bound dancers often finish high school online (which some public schools offer) while training with a professional company. I have observed other dancers doing this, but do not know the specifics. I think some state‘s high school requirements (like CA, MN, NH) allow for this and others do not (MA).
If she has a particular college program in mind (like USC Kaufman or Juilliard), you might want to explore the educational and training backgrounds of their existing students.
If she does attend Exeter, continues training, and ends up in Boston for college, Harvard has some amazing dance companies.
Good luck!