Since when does the customer set the price? Would she walk into a store and try that? I am glad you are sticking by your price, and hope you are going to get the $126 PLUS what you spent on materials. It's little enough for that tedious work with suiting fabrics. Those fabrics were never meant to be cut up into small bits like our quilting cottons are. They are tough to work with.
I wouldn't give her anything back that is already sewn into the quilt-- only the excess fabrics. She entered into an agreement with you to use those to make a quilt she would buy, and if she doesn't buy it, it's yours.
I'd set the darned thing on fire before I'd take a mere $60 for it....