Middlebury students are required to live on the VT campus for their first and senior years (with the rare exception noted below). I copied this from their Handbook:
“b. Residency . First-year students must be enrolled in a Middlebury course during their first winter term at the College. This includes both September and February matriculates. Residency in Middlebury, VT, for the fall and spring semesters of the student’s senior year is required for all students unless excused by the Administration Committee.”
It appears to be possible for your student to study away from the VT campus for 2 years if at least one of those years is at a different Middlebury campus, i.e., Monterey and Midd’s study abroad programs. That said, I think that only being on the VT campus for first and last years would be socially isolating.