Ita.What gets me is how cool, calm and collected the boyfriend's behavior was as he casually strolled into the gym, which was captured on security camera. Nonetheless, I can't think of anyone who could stab themselves that many times and withstand the pain, I go to pieces when I get a paper cut. Not to mention that in my own attempted reenactment of the moves she would have to make, she would have to have very flexible, even double jointed arms. It's just too absurd to even entertain the idea of suicide.
Graphic comment :
To stab yourself in the back of the neck and head, you'd have to possibly put both hands on the knife and plunge it in.
The problem as I see it is you can't get enough force with one or both hands while drawing them away from your back -- to push the blade in as deeply as her wounds were.
It's literally impossible.
Imo.