OP, I would counsel you to consider asking your HS GC (who seems to be a good one based on other threads) whether or not your D wants to submit a Music Supplement in the first place. It’s a different situation, but you might benefit from reading http://talk.collegeconfidential.com/yale-university/1812433-music-supplement-at-yale-after-playing-a-few-years-p1.html.
Just as most HS research papers are inappropriate to submit to HYPMS (http://talk.collegeconfidential.com/college-admissions/1806978-submit-supplementary-research-paper-during-mid-year-report.html#latest), most music supplements are also a bad idea. You surely mean well, but in applying to elite schools, less is more, except in those rare instances where a supplement is exceptional.
A personal example. The summer before senior year, DS interned at a physics lab. Among other things, he developed diagnostics software for a PhD candidate and was a listed co-author on a paper presented at a professional conference. We debated a LoR from the professor in charge of the Ivy lab, and DS decided to submit it as an additional LoR to Yale, although he was initially considering providing it only to the Ivy where the professor teaches. DS provided a link to the paper without drawing excessive attention to it (the paper/internship was, iirc, listed as one of his activities). DS did not consider submitting the paper as a supplement.
Good luck to your daughter.