I have a friend who made a lap quilt for someone out of her husband's favorite shirts. She included the plackets as sashing and cut square from the shirts, including a few of the pockets (one for his glasses, and one for his pipe). We all thought it was a great idea and it was like having a little of her husband with her. You could even put the valentine in a pocket.
Memories are wonderful things to have, especially when that is all you have remaining. Your daughter has not yet reached the age to realize that. Someday she will be happy and thankful to have that quilt and the memories it evokes.