Hi A.,
Do you have any pictures of her with her GP's? If so, either do a scrapbook page she can frame (or frame it yourself, at Michael's for $7.99 and use the 40% off coupon and it is still cheaper) or just a really nice picture of your daughter that captures her personality to give to them in a cute frame. Hobbly Lobby usually has all of their picture frames on sale for 50% and go that route as well. This is a cheap gift, but so memorable too!
I did one for my parents (12 x 12 Scrapbook page lay-out) as a b-day gift to them from my 3 year old son and I can email you how it turned out! It was so sweet and they will have it forever! Email me at ____@____.com and I will sent it to you.
Good Luck!
Gladys