[okie01]

"This had to be something planted in the car.....under the backseat....or dashboard set off by remote control..."

Probably so. But Ms. Smith had to already be unconscious. She was doused with gasoline, remember, so that she couldn't have been driving. Thus, somebody else had to get the car started and moving.

[Dog]

She was alive the ME said ...her airway was burned.

[_Jim]

Probably so.

Oh brother ... more mysterious, unexplained, non-present 'devices' ... you guys would make a fine batch of detectives ...