Oh, boy! I feel your stress! Since she wants it "yesterday", I would gently tell her that you are not able to quilt it for her. That you do not believe that you want to be responsible for the quilting now that it has been sold. It is too stressful and it would be best for HER to get it quilted by someone who knows more about it. Stick to your guns and put it right back into her hands and let her stress about it. Doesn't have the money? Then she will have to wait as the rest of us do when we can't afford a long arm professional quilter.
These types of things really get under my crawl. In fact, I believe she should share to profits with you! I feel better now. Good luck!
By the way, this is not being confrontational. It is being honest and caring about HER quilt!!!