I will second this comment, speaking from the perspective of parent to two kids who graduated from the hidden gem boarding school where I work (and who now attend their perfect fit colleges).
There is tremendous benefit to being “true to your best self” (to borrow my school’s motto) in an environment where you can take advantage of ample opportunity, explore and grow, deepen your talents, but not feel hemmed in by pressure/burn out.
My school is not on your list, but I wonder if others of a similar size might be worth exploring as a point of comparison? Dublin School can be a nice fit for an artsy, smart student who wants to have close relationships with supportive faculty. If your daughter is open to girls’ schools Emma Willard is likely not too far from your home base and offers fantastic programs in academics and arts. Holderness School might be another to check out.