JMO
It bothers me too and it is a scary case. So much mystery surrounding the case and the fact it occurred at the Cecil Hotel is what makes it very scary to me.
There was a TV special about murders allegedly committed by people that stayed at the Cecil Hotel. So its a scary place to begin with. I could not believe how many murders were allegedly connected to people at that hotel.
The infamous Black Dhalia case
The Night Stalker - Richard Ramirez was rumored to have stayed there
Quite a few others
Elisa likely had no idea the place was kind of dangerous to begin with.
The thing most mysterious to me is the video footage of her on the elevator. It really was like there was a ghost she was seeing. And it would not surprise me if she saw a real ghost.
https://en.wikipedia.org/wiki/Cecil_Hotel_(Los_Angeles)