Ozma traded away the first Dorothy's bones.She seemed to be in a desperate postion when we last saw her. The bones were either added to the bone door or used to create Emma as a means of getting around not being able to use the bone door to get to Oz.
Emma is not meant to open a door...She is meant to lock one. Specifically, the Bone Door.
Elaine is meant to be the writer for Pinocchio.She seems to have a knack for turning constructs into real people.