How competitive is JBS admission?

We are considering JBS for our youngest daughter, at her request. She’s currently in 7th, so would be applying for 8th. Our two older children are both at boarding schools, so we are very familiar with the high school admissions landscape, but I haven’t been able to find much about the JBS admissions landscape. How competitive is it? Reasonable to expect that a good student with good recommendations and average extracurriculars will have options? We are looking at Fay, Rumsey Hall, Rectory, and Indian Mountain. Also Grier, though that would obviously be for 8-12.
@PhotographerMom