I feel very much for Prisma's family. I cannot imagine the worry, anguish, and frustration they feel as her disappearance nears the 6-month mark. However, I worry that they are running around thinking every single person Prisma had contact with on that afternoon is responsible and had nefarious intentions or is shady, and that they are missing out on eliminating possibilities which, IMO, given that she was caught on surveillance all afternoon or there were plenty of witnesses to seeing her because her actions were neither cautious nor in places without cameras, seem more likely and logical. I understand; until she is found; every person is a possible suspect but people that were really far away or have no motives seem to be a stretch; my suggestions is to focus on the horses; not the zebras. LE to date seems to have been highly successful at tracking her all throughout the afternoon with strong evidence and video. What happened to her after 6:01 is the obvious question - no surveillance; car abandoned; no more phone calls. Whatever happened to Prisma almost certainly happened at or near that building she was last seen and I've said it again but I would make darn sure she wasn't still there and the victim of an unfortunate mishap or an opportunistic predator.
I don't believe she voluntarily left; though the babysitters' actions do give me pause. But she would have just taken her car - clearly she didn't have any qualms about driving around in the state she was in. I also don't think her ex- is involved; as obvious of a suspect he is. The fact that she was seen for hours on her own doing her own thing, even though she was trying to reach him, speaks to me more of her seeking him out rather than the other way around. If he got upset with her, he could have just invited her back to his place right after lunch and that would have been that. It just seems too complicated and convoluted for him to have done harm to her after all that, given that her actions seemed irrational and unplanned. It would have had to been impulsive. I do hope LE has verified his alibi, which it sounds like they have; and they have tracked his cell records as well. Don't know if they had enough to get a search warrant for his apartment; but if he was involved that would be an obvious place to find evidence given the amount of witnesses and people around that building. But again, this is not my theory of what happened and I think by now they would have something.