Do you have a deck or porch? I would get an iced tea (in a spill proof bottle!) and take an afternoon and remove all the ties. Use a pair of scissors with sharp points and carefully snip the knot, making sure you don't cut the fabric. They are going to go all over, hence the deck/porch question. Looks like it's edged with gathered eyelet, so I would guess the back is joined using a pillowcase method. Find where it was turned and unpick those stitches. turn it back inside out and cut a piece of batting to fit and re turn the quilt. This is also called birthing a quilt. There are lots of videos on this. Once it's turned you can quilt it or tie it again.