Diane I so sorry to hear of your tragedy. You are right to be concerned about how to handle fabric that old. I think you best bet would be to call you closest museum that has a textile department. I am out of touch but there are special products to use on old fabric that will not harm them and won't leave a residue in the fabric after. Be very careful lifting your quilt if it is wet. Museums and conservators often lay a fragile item on a mesh screen so that no part carries the stress and weight which will cause the fabric to tear. Perhaps someone on the board is qualified to give you more information. This is a very helpful place. Welcome.