"He was a lot of things to me" "The only conclusion was love"
I strongly suspect that Eloise Gardner is the witch whom Victoria (aka Rapunzel) has locked up in her tower. As far as I can tell, she is the only missing person in the story so far
I wouldn’t count out Anastasia since they deliberately covered up her face with a veil but I don’t know how that works given the timeline–how old is Rogers’ daughter supposed to be? Emma Booth’s character, the Witch in the Tower, is old enough to have some sort of history with Victoria and exude a “wise witch woman” aura. If she is Mother Gothel, and they go the Tangled route, then the Witch is quite old and is looking for a way to stay young.