Problem is she doesn't have a sewing machine. Go to the fabric store and find some iron on tape for "seamless sewing". I haven't looked for this for awhile and there may be other brand names, but Stitch Witchery used to come in a roll about 1/2 inch wide. ( If you can't find it, go to the interfacing section and find the equivalent there and cut it in strips yourself.) This is sticky on both sides and will weld two pieces of fabric together without sewing. Just a tip, if you don't press too hard at first--just a very light touch, you can "try it on" the bed to check it. Then, if it fits OK, go back and really press it in place. If it doesn't fit, a touch of a steam iron will soften it enough to pull it apart and reposition to the correct location. Good luck!