The quilt is yours to do with as you see fit or need. If someone else had won, the guild might not ever know what happened to the quilt. If you can get a good price for it, sell it. The guild should be thankful that you are putting it to good use by say buying your medications which you need more than another quilt. If you should donate it to some charitable organization, be sure to get a receipt for the value of the quilt. Then itemize on your income tax and take it off as a charitable donation.