I knew I left out something important! Yes, there are LAC’s with excellent music departments and academics, of course, and some do offer a BM. But it sounds like your daughter might prefer a BA program or even majoring in something else and continuing music, because she is multi-faceted. I believe most BM programs will be focused more narrowly than she might like, though I could be wrong.
A few years back I was actually surprised at the number of schools that do offer a BM in performance, as well as a BA http://www.pugetsound.edu/academics/departments-and-programs/undergraduate/music/for-prospective-students/. Then again there are BA programs that also have performance http://college.lclark.edu/departments/music/ for example.
When there is a BM program (as with Oberlin, mentioned above, or the one I just cited) it is just a good idea to make sure opportunities aren’t limited by the presence of the conservatory or BM students in general.
Randomly, schools that might be good for a multifaceted student with academic interests- and you probably already have a list (and Rayrick compiled one awhile ago) might include many of the Colleges that Change LIves schools, College of Wooster, for example, Bennington http://www.bennington.edu/academics/areas-of-study-curriculum/music, Clark University in Worcester, Tufts, Williams (I have heard their music department is great), maybe Barnard (across the street from Manhattan School of Music and Columbia), Vassar, Sarah Lawrence, (proximity to NYC is nice), Macalaster, Carleton… then of course Bard, Oberlin, Lawrence with the one concern about the presence of conservatory.
Just hit me that Brown or Amherst could also be great: with the freedom to choose classes (non gen eds) there is room to do a lot of music and a lot of other things in 4 years.
Again, I don’t think the number of music majors is necessarily the best indicator. I know at Tufts some very high percentage of students participate in music but the number of majors is much smaller. It is possible that a small department (Harvard has a relatively small number of majors for instance) the department is more personalized and there is more individual attention, so small can be good too.