It will depend whether her mother was accompanying her because of - (1) She's underaged to be allowed to travel by herself and her mother had to accompany her so she can perform. Or, her mother was an integral part of her team that she needs around for her to perform. Also, it will be a good idea to have records showing her mother was reimbursed for the car rental. The meals and the air tickets can be deducted as necessary business expenses in schedule C.
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