Floursack Mama, you have a treasure. My grandma and aunt sent me one for Christmas one year they'd made. It sure made a big difference on the bed in the wintertime when we lived in Wyoming.
I've repaired a few that came undone when quilters put them together with cotton threads that fell apart from the weight in the washing machines. It was hard work, and I didn't think it was too beautiful, but the customers I had were so happy to get their great grandma's quilt back ready to use again they didn't seem to mind, because all that really mattered is that they had a little piece of grandma's legacy after she had passed. I used a decorative zigzag stitch in the best polyester thread I could lay my hands on, and I'm pretty certain those quilts do not need another repair to this day unless they put it in the chipper. heheh
I love your quilt.