How about a pocket card with gift card to dinner so that they can have "date night"? Isn't it wonderful to have friends/neighbors that are as close as family? You could also decorate a paint can and fill with various items that are of interest to them...gift card to movie, dinner, etc. You can have your little one make something for them...her handprints in an altered tin scrapbook, photos of her, her artwork. That's all I can think of right now. HTH
BTW...congrats and good luck!!
Hugs, Joanne