Sometimes when washing larger items in a top loader, one section can get hung up, kind of under the agitator?, and then as it moves, it puts tremendous stress on the fabric. I wonder if that could have happened here?
I would stitch up the seams that tore, and then sprinkle some appliques over the top of the quilt :wink: The only one who will know this was an after thought will be you :D:D:D