Go with what you have on hand. Don't make it any larger than twin size. I have had experience with nursing homes and things that are donated. Some times items just disappear, especially if it is colorful and/or fluffy. The patients who do this don't necessarily think it is theirs, they just think is it pretty and want it. Staff did find some things. Also things disappear in the laundry. So when quilt needs washing, take it home and wash it. In a lot of nursing homes, staff just tucks anything extra bedding included away to save work.
You are a saint for making this in the first place, but don't let it get you down worrying about it.