I would either let her purchase the fabric and other supplies or at least take her with me to purchase them so that she would know the true price. As a hand quilter I charge 6 cents a square inch for me to hand quilt the item. If I were to machine quilt it I would probably start at 2 cents a square inch. I would also charge her at least minimum wage to do the basic construction of the top. Unless you have access to wholesale prices you are bound to be more expensive than a commercially made, probably in China, quilt. As quilters we need to stand up for the value of our work.