Found something else interesting that might give us a hint about Annabelle and I'm surprised I haven't seen anyone mention it. It's in the REALLY bad ending of chapter 12 when Hunter kills Drew, Lucia and Sterling.
I know stuff in the bad endings isn't canon, but I wonder if this hints that Hunter is quite familiar with New Annabelle (and she works as a cleaner/fixer for him or something?) It also suggests that New Annabelle knows about Hunter's plans with the family and didn't expect them to work out. It also implies there's another woman yet to be introduced that is saved for kind of a grand finale.
I guess it's also possible the person he's talking to isn't New Annabelle and is perhaps someone who is keeping an eye on her at the convent- meaning New Annabelle would be the woman being saved for when he's "done changing minds."
EDIT: In retrospect, I'm guessing my second option is more likely, especially considering Annabelle's line in the canon ending:
"Crud...I just got dropped off by a guy I don't know!"
But that also means that in the canon ending, Hunter called this person and told them to bring Annabelle to the house. I guess he thought he had won after showing the girls all that "evidence." Yeah it's all making sense now.
What I'm wondering though is what he meant by
needing her once minds are changed. Maybe he'll say she's the final part of his grand vision of bringing the family back together or something. Obviously she doesn't know what the hell's going on, so I'd imagine she'd need some mind changing as well.