I would find that devastating if it happend to me.
It's a wonderfull thing (and very mature) that the girl did. However, I think that if my own child died, and I were to find random notes from her hidden in a book, or in winter clothes, or in a drawer, etc. I think each time I found one it would start the emotions all over again.
Hopefully I will never have to find out what it's like.
I now know that when my kids write little notes to me it means a lot. It also provides wonderfull insight into just how much they look up to me and must think I can do amazing things. I got a note from my 8 y/o this weekend. She was just drawing, and made a note that said "Dad, you rock" and it had a picture of me on it. I was doing a one armed handstand on my index finger. According to her, that is what I do when I do yoga. Now I mean I am flexable, and in decent shape, but I can't even do a normal handstand, let alone on one finger

-dave