All is not lost. If I were you I would replace the strip by appliqueing the correct colors in the strip, then repeat some of the quilting. I had to do something similar once when making my very first commission quilt, as for some unknown reason some of the black triangles on the roman stripe quilt developed holes. I "fixed" the quilt by appliqueing black triangles over the "holey" ones, then, quilted over it with the diagonal lines I had used to quilt that quilt. Fortunately, I managed to correct the problem and the person who commissioned the quilt was happy, but I was so embarrassed that this happened, as it had never happened before or since. Your quilt is beautiful, thanks for sharing.