The later posts on this current thread discuss merit quite a bit Class of 30 Undergrad/Class of 28 Grad: All Things Related to Music School Applications (prescreens/tours/interviews/auditions/supplements/etc) - College Majors / Music Majors - College Confidential Forums
Twelve schools is still a lot! Are you assuming she won’t pass prescreening at some of them?
To me it seems strange that she is applying for performance at some schools and music business at others. Which is her priority? (In our experience, there are other ways to get experience in music business, such as interning or volunteering, if performance is her preference.)