Assuming the autopsy can tell us something - and that's asking a great deal, given the corpse's condition and the political intrigue in Memphis - we should be able to find out whether she was already at room temp (or at least unconscious) when the perps poured in the accelerant, lit it, and pushed it into the tree...OR if some kind of remote-detonated fuel bomb was used after they'd aided her path toward the tree.
This particular incident has all the hallmarks of a botched assasination attempt that succeeded despite the stupidity of the perps. They DID succeed in bumping her off. But they did it so poorly that the fact that it was a "hit" was immediately apparent.
That said - for a mere drivers' license scandal, someone wanted this gal dead REALLY BAD.
Michael
Is ther a bottle or bottle fragments that contained the/a flammable liquid?
What kind flammable liquid do tests indicate?
Was the car in gear - was the engine key in the 'run' position?
Professional hit men and insurance fraud guys know exactly what type
of flammable agent to use that will burn real big and stop at any point.