I thought that in their YouTube video, she came across as confident yet very sad (in several parts she looked to have been crying).
In the police cam body footage, I thought she came across as a very sweet, yet naïve young lady who made a lot of excuses for him.
I don't like him from what I've seen of the way he talks to her and the way he carries himself ... he comes across as extremely arrogant.
When I first heard about the case, I was leaning towards publicity stunt, but after seeing her mother's plea to find her, and then her stepfather going out to the desert to look for her, changed my mind on that. I think the boyfriend pushed her, and she fell; but rather than help her, he drove off - thinking, "That'll teach her" - he just gives me those vibes.