Her phone was off at 8:30 a.m. If she'd called someone to come get her, and THEY did something to her, say in a fit of rage (ex maybe?), it would have been in broad daylight at that point in time, on a road that has multiple houses on the way back to towards town. That doesn't make sense.
If she took off walking and froze to death, the dogs would have scented her, in that area. The guy from the team, said, that he could at least rule places out that she was not, now.
I wonder if "white car guy's" parents were home that night. I've heard some things, but feel his parents would not have been home, if those things were going on there, in the past (but who knows).
I think, if nothing else, that phone pinged in off one of those towers, or they'd not be there.