Hi Arturo, I'm sorry youre going through this.
Do you know if maintenance was questioned at all about seeing her? Maintenance staff at some complexes sort of wander to different jobs, have keys to all apartments, have a vacant list of apartments, and would be someone I would think would be most likely to see a woman upset and crying, realize she has no key and isn't a resident, then ask about it. Maybe more than a tenant trying to mind their own business would.
My guess is that the lunch with R went unresolved and she stewed on it while drinking. She then had some confrontations and did a turn around and decided screw that I'm going to R's house. I'm guessing that she is blowing him up and saying she's not leaving and is most definitely going to cause a scene. She's drunk and angry about however the lunch ended. He comes back from "out of the city" which I dont really know what that means or how far away bc out of the city can mean 20 min.
I'm not sure how the silver car ties in. Did they break up recently? Is it possible she had keys to a second car of his? The top floors can sometimes be overflow parking vs assigned based on your floor.
I guess to sum up all of my questions, was maintenance questioned? Just out of curiosity because a "good samaritan" like a staff member might make Prisma feel relaxed and let her guard down especially if in her state, she believed she would get taken to the correct apartment and that person had keys to all apartments plus a list of residents. On that floor with the silver car does staff park there? Is there a maintenance unit or other type room like that nearby that floor or near the silver car?
As for R, did he own a silver car? Is R known to deal drugs or have some activities that might be jeopardized with an ex causing a scene at his apartment with maybe the cops showing up? Or if she said "get here or else I'll do x" and so he hurried back somehow worried that she would call the cops over some activity? It just sounds like as you said, it's the ex or a random opportunist, but with the opportunist a lot of opportunists I think would be less willing to attempt an abduction on a hostile woman. Someone would need to sway her and thats why I do wonder about maintenance or who would be assigned or best suited to parking on that top level. As for R, I think if he had some operation that Prisma could "blow up" by being there upset and confused, he might have reason to cover up his return time ahead of time. As in he was planning to silence her. Otherwise I'm thinking, in a building that large with an ex that has no idea which apartment, has no key, I'd just go about my day and hope that she got it sorted out herself. It seems like that is what he did, but in combination with a volatile lunch, break up that went poorly, potential DV in the past, it seems less likely. Especially since he did speak with her after she was at his apartment building. I think it's even more likely that he returned to finish conflict since it wasn't "over" enough for them to not have contact at all or have a friendly lunch. That makes me think he starts getting his phone blowing up with calls from Prisma who is angry, drunk, and sort of stranded in his complex that he comes back to deal with it ASAP. thats how volatile relationships go and especially if he is involved in illegal activity that she could compromise.