I'm sure we all have had experiences like yours. I was fairly new to quilting when I was asked to make a king size quilt and was being paid. I was so embarrassed when a couple years later I was told that the quilt had developed little holes and asked if I could repair it. Apparently I must have used older black fabric, or it was defective when I bought it and I didn't catch it. After much debating with myself, and since it was a Roman Stripe quilt with black background, I opted to replace the black triangles, appliqued them on the quilt, then did the straight line stitching over the triangles, which amounted to almost half of the quilt. If it had been a gift to a friend or family member I might not have felt as bad, but this was my first commissioned quilt; although the owner of the quilt was happy with the repairs. Lesson learned, look material over carefully before buying and before using from your stash. On a happier note, I think it is wonderful that your DIL loved the quilt so much that she wanted the quilt repaired and didn't ask for a new one, although I might have been tempted to just make a new quilt. Like with sewing, I'd rather make a pattern from scratch rather than make alterations.