How sad. The rule at our house has always been no food or drinks except in the kitchen and the dining room. There is no reason for it. After all, it only takes a second to walk in to the kitchen to get a drink.
I would take them out of the trash and soak them in cold water. Then air dry, press, and use them. It will wash out when you wash the quilt.
Good luck to you. :) Go give your daughter a hug.