Perhaps an incindenary device was remotely set off in the car cabin while she was driving. Or she stopped by the road and was pushed further off. For some reason she was unconscious--and the cabin was then torched.
Those are a few ideas I have. The stories generally read, as I assumed, that she hit a "pole" next to the road, like a traffic light. Untrue.
This is what caught my eye in the first piece I read. I have seen some horrible accidents in my travels but very seldom have I seen "firey" accidents. Especially at low speed where the gas tank was not ruptured.
Keep an eye on this one.