Just ONE question to you. Piano (mustic) is future major?
If you consider music is her future major, you should continue. Otherwise, should not continue because
1. you have enough plates (you only need 2~3) to fill in the application form. You have 3 or 30 plates that's no big different.
2. If you have epa > 4.5 and SAT closed to full that you can continue
3. Manage time for something else
My daughter has exact same situation, I will ask her to stop.