Apart from Ivies, some of the “little Ivies” like Tufts, Amherst, Williams…Clark U. in MA, Vassar, maybe Barnard (next door to Manhattan SOM, affiliated with Columbia of course), Smith (In consortium with Amherst and UMass), Wellesley…just a start. Is MIT too large? In the midwest Oberlin (Musical Studies courses with possible access to conservatory), Macalaster, in the south Davidson, Elon.
I am assuming she does not want a BM.
There are many schools. Some of the smaller schools’ students play in the regional orchestras.
Maybe she can start by choosing schools based on her academic interests, location (weather!), size, cost and “vibe” and then look at their music dept. sites.