Assuming that you had 1/4" seams and not smaller, and that you had already pre-washed the fabrics; You can add a 4" piece all the way around the top, the batting and the backing and send it to a long arm quilter. After it's quilted, you can cut off the excess as it was just used to "hold onto the quilt for quilting". This is the only way I know to salvage this quilt without re-doing it. Have it stippled all over or something similar to shore it up. In the future wash on delicate and dry on medium heat.
The lesson learned here unfortunately is that some of the fabrics that we try to highlight because they are just so beautiful must also have good quality. Ask me how I know...