You are certainly being helpful to try ane fix this problem. BUT i it is not be your problem to fix. Unless it was your fault when you quilted the top and added ( ?) the border. . Have you discussed this with your customer and see what she wants or thinks. Also she should be the one fixing the problem if this is an issue for the customer. I personally make my quilts asbout 70x90 and lay them across a king size bed. I have a ivory colored non-quilted bedspread covering the bed so the matress does not show and the quilt drops over the sides. I think that it looks very nice.