For the door to be loose enough to open like that, it would have to be rattling around with the door ajar light on at the very least. Doors don't just pop open like that, at least on modern vehicles.
A lot of people beat up minivans pretty bad, and maybe if this van had a badly damaged front door and it's held shut with rope, wire, or some other ghetto fix, this could happen, but that's really doubtful. Even a partially latched door should not open.
It does sound like an "I don't want to admit to texting" kind of story.