I don't know. I think, by the injuries to her face, that she was beaten. Her facial injuries do not look like they are the result of falling out of the car. No "road rash" on her face, no visible scrapes or cuts. Her bottom lip is fat, like she was hit in the mouth.
It's wierd that her death is listed as "undetermined". That makes me think that the investigators don't believe that her death resulted from being pushed out of a car. I mean, they say she was pushed out of a moving vehicle, and that they know this, but then go on to say he death is "undetermined." Strange.
I think that if they really thought that she died as a result of being pushed or thrown out of a moving vehicle, then it wouldn't be "undetermined".