In a way, this kinda reminds me of
Nicole Morin's case. Nicole, age 8, disappeared from her apartment complex. Nicole was seen inside, but was never seen going out of it, so one theory is that another resident could've lured her to his apartment, held and killed her there, then disposed of her body in secret.
The only difference for me, though, is that Nicole lived there. A resident could've stalked her for months, noting her routine, when she'd go out alone, etc., and planned around that. Nicole could've also felt comfortable with this person because she recognized him as a neighbor.
Prisma didn't live in that residential complex. She didn't even have access to it, as she has to run behind a vehicle before the gate closes. From the haphazard way she parked outside, her visit appears to be totally spontaneous and intended to be short. And the only person she knew at that complex, who had motive to harm her, is confirmed by police to have been in a different city at that time.
This is why I find it hard to believe that some random resident lured her to his apartment. It would've been the chance of a lifetime, to happen upon a female in distress practically at your doorstep—no knowledge of routine, most likely the first time seeing her—and then decide she's the one he wants to target? True, some criminals can be this opportunistic, but usually it's out in the open, far from witnesses. Here, he would've had a building full of witnesses.
And then would Prisma have fallen for that? She's described as crying and emotional at this point. She was also angry enough to get into a road rage incident earlier. I just don't see her calmly and quietly accepting a stranger's advances. I also note that it looks like Prisma is using her phone on speaker. People tend to speak louder when they use their phone this way, and of course the other person will be just as audible. She would've already been creating attention, a deterrent for any would-be criminal.