Yes, you have to file a tax return for your daughter if she gets paid for her music performances. You stated "Her music performances are often paid".
Are the festivals tuition? If yes, they should be on her 1098-T form. Travel is not a college education expenses. You may be able to deduct these as business expenses.
Qualified Education Expenses you can deduct:
Tuition
Enrollment fees
Expenses paid to school, on condition of enrollment (lab fees, for example)
Certain books, supplies, and course-related equipment
Expenses listed above (for the following semester), as long as the semester begins in the first three months of 2019
