Give your granddaughter a little talking too :) I am 24. When I graduated from high school my grandma made me a beautiful pillow. She chewed my butt when she found it downstairs in our basement. I had only taken it downstairs to prop it up and lean against. It was a great size for that. But she was really upset that it was just left out. So I learned my lesson and always put it back on my bed. I have all of the wall hangings now that she has given me and table runners out on display even though they do not necessarily match my home or each other :) I leave them all out because I know now how much time she put into them for me :)
So maybe your granddaughter just needs to know how much love and time went into it. As for the fiancee she might need to know how much effort is involved as well.