Pure and simple------if she bailed on you once, I would not make it unless SHE purchased ALL supplies (fabric, top & backing, batting, thread, and etc.) PLUS COLLECT UP FRONT, AND an amount you come up with for labor for sewing AND quilting (don't forget your time for drawing up the pattern) ---- or the deal is off. Your signed contract can state JUST THAT. Hopefully, there won't be any cost for any unforeseen costs that wasn't included in the above contract; if so it may be less than being out the entire thing. IMHO, I WOULD NOT BE SATISFIED WITH ANY KIND OF DEPOSIT AMOUNT---full payment up front or nothing.