We had a house fire many years ago and all my fabrics were smoked and edges were scorched. What I found out was that the scorched places were weakened and the smoke stains would not come out Save yourself a lot of trouble and just throw it away. It won't wear very well if you do manage to save it. Such tremendous heat makes it worthless for quilts that you want to last a long time. Maybe you and some friends can just start a new stash for her.