I am not sure why Elly is trying to bargain with Elizabeth on tooth placement. Can’t she just tell her the Tooth Fairy drops no money for kids who can’t follow the “under the pillow” rules?
I have no fault with Elizabeth’s reasoning. I would want to see what the Tooth Fairy looks like too. To a little girl, Santa Claus is an old man, the Easter Bunny is a rabbit, and that just leaves the Tooth Fairy as the only female representative in the “lie to your kids” series of mythological characters.