That’s a good idea! It is plausible to believe that Greg is a Lost One, but I’d have to know what Tamara’s deal is before I say much on her. I don’t believe that she has any relations in the Enchanted Forest (or any that she knows of).
Also, what’s Tamara’s deal with saying that things were “unholy” or “abominations”. I don’t think Peter was much for spiritual brainwashing, so I’m even more hesitant to place her anywhere near Peter other than being a blind follower. 😕