@ArtistErin What a great idea, and potentially sad or even scary Eg if the girl realizes living in a dollhouse is not so great after all (especially if you have to always do what the big kid-'owner' wants), and wants to come back to her old life, but can't.. Then the story can go in multiple directions from there!
I love this kind of stories, a bit dark!
Mine was actually an idea I had as a child (5-6yo) - how cool would it be to have a terrarium with tiny ppl living in it? I remember clearly drawing that back then. A few years later 'The Sims' game emerged - and in a way I could play that out