Physical security. Does he know where she lives and does he can follow her, access her wifi, follow the children? Rummage her trash?
From what I gather, all relatives are on board with the victim leaving. Point taken, though.
The victim packed up their apartment and left today with a U-Haul and is en route to a neutral location that the abuser doesn't know of. Only the victim's parents (and me) know where they are.
Everyone I talk to says the same thing- people are the weakest link. There's something to that for sure.
Few more things that I came up with. Service accounts. Social engineering call centers is evergreen. If he knows her bank, he can extract info from them. Check if she can switch accounts or that the address is not up to date. Not sure if he can find/buy her spending patterns from an info brokerage firm.
Also, her parents location data and call history is precious. Sooner or later they will want to visit her and they will insist on talking to her every day. So, no phone calls, voip only. No phones on visits plus ensuring they are not followed.