Maybe she is really embarassed that she didn't call you back or just plain forgot. I would call her and ask how the wedding went (or some other ice breaker) and ask how much of the fabric she used, if she plans on giving back any of it and how much she will pay you for what she used. That is not a nice thing to do to someone who helped you out when you needed fabric! She needs to "man up" and pay you! Put your big girl pants on and tell her!!