depending on how large the area is, you might square up that edge of the quilt and thus reduce the amount of unsewing you need to do. It will mean being careful when you re=quilt it...but when I did it, I squared up that one side, then put a piece of wash away stabilizer under the area I was re-quilting and it came out fine. the rest of your work is amazing....don't get discouraged over this bump in the road.