I ordered a huge backing for the quilt. I tore off extra on sides leaving several inches over. I then tore bottom off for same reason; big mistake it tore 'crooked' What a mess but luckily it was a patterned backing and I had lots of fabric left over so I found same spot, overlayed it and slipstitched it together and finished quilting it. No one knew what a mess I had made and camouflaged. I'm sure your friend won't mind an extra seam at the bottom. Use your extra fabric from the sides and quilt on!