Because online scavenger hunts are no fun? If you're going to do a scavenger hunt at least do it around the house and at every spot she gets to she gets some small gift (a flower, something shiny, etc) and in that gift or tied to it is the clue to the next spot. And at the very end she gets something memorable.
Oh, and if you really trust her investigative skills you can leave her alone to do all the hunting and have yourself wait at the last spot to give the gift personally. But if she's not too speedy in the head.. well.. you could be waiting out there for a while. haha. Give her three cheats via cellphone to you.
