If you (or she) look at the “Read Me” thread above, you will find an essay by David Lane entitled “Double Degree Dilemma.” It might be helpful. It is really about different ways to study music, using hypothetical individuals. It does leave out one good option, which is to do a BA in music or something else, continue with lessons, and do extracurricular performance. But the essay may be helpful since people are also suggesting some schools with double degrees (Bard actually requires conservatory students to do double degrees…)