Early on I considered this theory in earnest. It made sense to me that a woman crying or distraught could conceivably run off the road. I rear ended someone once when I got some really bad news and was driving very,very upset.I agree that this is a possibility. It could be that she was driving somewhere which noone has yet guessed to search (or has searched, but missed the vehicle). However, the longer the disappearance goes unsolved, and the more that comes out about her spouse, the less convinced I am of this scenario.
Poor lady, if this is truly what transpired. Can you imagine gearing up for a 'battle' with your cheating husband, and then just coincidentally running your jeep off the side of a cliff?
But I ultimately gave up on this notion because ,imo, she would have been discovered by now.