Bear I'm sorry this happened. How discouraging and depressing
Many people have no idea how much materials cost and how much
SKILLED labor goes into making a quilt and therefore cannot determine the value of one.
You could try contacting the organization and making sure that they are ready to use an expensive item like a quilt in their fundraising. Some have no experience using big ticket items.
Another option would be for you to sell the quilt yourself and then donate the money.