Obviously, Millie Potts here is open and ready to mix with her big sis! She needs plenty of guidance, even though they might butt heads on some of it, especially regarding Zinnia's scandal and any overbearingly mother-like tendencies. Millie will certainly take it better from Thea than she would from their mum. We already have a thread started, so that'll be a good place to start.

As for Charley Goode, it's possible there would be a chance encounter with her when Thea is out and about with her ward, but otherwise they don't have much reason to cross paths. She might just laugh at the absurd situations she reads in the Witch Weekly.