17 year old daughter signed a contract.

My 17 year old daughter put money down a car, the man told her he was going to fix it for her and have her come back in a week to fill out all the paper work, she is turning 18 then, he has not even moved the car to start the work, and my daughter called him about it and he told her he will call her when he is ready, she now want to get her money back, he told her no. is she able to break this contract with him being he had a minor sign it? - Is this your question? Add additional information