Literally makes no sense, never seen anything remotely close to a viable explanation
The elevator footage is weird but I remember when I first watched it I thought:
It's not closing, she's on her meds, maybe she thinks someone is there that's stopping it shutting like it would if a person stands in the doorway. Then I think her gestures and speech is her talking to the door like why aren't you closing, presses too many buttons, gives up, walks off. Maybe after that she decided to use the fire escape to get to the roof. Maybe she wanted to go to the roof in the elevator?
Certainly dodgy and not out of character for that hotel.