While I do feel that the 911 one calls and the fact that the roommate actually described her to her face using the words "delusional and paranoid" are clear evidence of a mental break, I see nothing in the videos that would point to that. In the video where the media says she was having a 'conversation with herself', it is clear and obvious that she is talking and gesturing to the dog. In the video of her running, it just looks like she's running, that's all I can say. She does turn around at one point to look behind her, but nothing that I think is 'eerie'. I am concerned, however, with the 911 calls.
In reference to the people saying they are surprised the roommate did not call her family, I will say that I am not surprised even though the roommate has concern. I had roommates for MANY years and none of them ever had my parent's contact info, nor did I have theirs. In fact, a few years ago I had a friend who was clearly having a mental break and acting bizarre. She would not let anyone help her, and many people were trying to get the phone number of her family (even though we were in our late 30's) because there was nothing else we could do to help her. In other words, she did not think she needed any help or anything was wrong with her. I heard that someone did in fact call her mother at one point (who stated these mental breaks had happened before and that they were aware of the issue), but I have no idea how they got her mom's number as she was from out of state. It may have been Facebook, but I'm not sure what her settings were. The only way I could have gotten her family's contact info personally would have been to break into her phone, and I just didn't have the opportunity. Sadly, I believe she is either bipolar, and/or had schizophrenia and had gone off her meds, (because this seemed very episodic) but that's beside the issue. It is not necessarily easy to contact the parents of a roommate or even a friend, unless you have a supportive group of people that have decided to put their heads together and pursue that.
I agree with the person who said it reminded them of Teleka Patrick or Leanne Bearden--the fact that the parents are in a bit of denial and don't want to discuss any mental issues. It's now out there in the media that she is perhaps "delusional and paranoid", and if she's in hiding, that may push her farther away.
If drug involvement are a possibility in her behavior, what kind of illicit drugs would make someone act this way? I'm curious. In my previous friend's case, drugs and substance abuse came about at the same time as her odd behavior, but I was not sure which caused which- the drugs or the mental disorder.