Hmmm...how about going to church with your Mom and "just running into" the woman. Strike up a conversation about the wedding, ask how her quilt's coming and was she able to use any of YOUR fabric? Mention that you would like to have back any of YOUR fabric she didn't use and you could stop by on your way home to pick it up!! Maybe this conversation face to face and hopefully in front of family or friends might help resolve this for you. I guess if she "forgot" she intended to reimburse you she now would have a chance to remember.