I honestly do not know what the elf on the shelf is exactly, or how it works. It was not a thing when my kids were little. Our little granddaughter, Lilly, is 8 and she still believes as well so I totally get it and love it! I know they do elf on the shelf at her mom's. Bob and I were talking about gifts from Santa the other day. Santa brought his kids the really cool stuff. With mine, all their cool gifts came from me and Santa brought the stuff they needed.
I raised Lilly the first 4 years of her life. She is my 3rd child in my heart and mind and always will be! This year her Gigi and Grandpa Bob brought her the big stuff and Santa brought her power cords and batteries for the cool stuff we got her!