How can you be "fairly positive" that she's having a mental breakdown, without audio, or without knowing if she's talking to someone, or what she's saying? Sometimes people in a certain profession see what they want to see, and put up blinders on other explanations. I doubt you can make a reliable diagnosis based solely on that video, and without knowledge of her behavior prior to the incident.
The elevator door didn't close, and she expected it to. Even though it was her own fault, she was standing perfectly still until she realized the elevator door wasn't closing. What suddenly made her change her mind of going down the elevator, and instead, upwards to the 15th floor, down the hallway, through a fire escape window, up a long ladder, to the water tanks, up another ladder, opening a lid, stripping naked, hiding her clothes, jumping in, and closing the lid after herself? Did she ever exhibit these symptoms before? Yeah anything is possible, but possible doesn't necessarily mean likely.
I think the real stigma is assuming that anybody with a mental illness is able to suddenly break down and do the unthinkable - regardless of their past history. Imagine if you're a mental patient, but with nothing severe - what would you think if people assumed you can snap at any time, and didn't want to be around you? Or if the first thing you did anything "abnormal", people assumed it was a mental breakdown? Even normal people act strangely sometimes. If Elisa had a pattern of climbing to strange, unfamiliar places, and hiding, I would put more weight into this theory. But the only symptoms we know of are staying in bed all day, and being overly talkative.
