Back when I went to wash a blue, red and white logcabin quilt for my mother, I didn't notice the red had bled on the white and it went into the dryer and got dried. I was devastated but asked here online and someone said to put it back into the washer with a color catcher or two and wash it again. Thankfully, the red came out and it went into the dryer again. Quilt saved.
I don't wash my fabrics before I cut them but I do starch them heavily but dunking them into a tub of home-made starch. If they're going to bleed, they'll do it then. Back when I made the logcabin, I wasn't starching so it bled. Should have known since I had red fabric but wasn't thinking. Also, my house was on the market at that time so I was just trying to keep busy until it sold and most of my sewing room was packed up and in storage. So try washing it with a color catcher or two. I also have one of those washers that can take the larger queen size quilts too.