I agree. As I've said numerous times, I think the most likely scenario is foul play at the hands of someone close to her. But until we have more information, I think everyone is obligated to consider other alternatives...Mollie T. was accosted by a barely known acquaintance, Toni A. turned out to have taken a wrong turn down a ramp into a lake, authorities found a woman who pretended to be abducted at Disney World.
Also, 8 hours is a long way to drive to make it look like someone used their cell from far away too...so there's still a chance she's out there on her own accord.
So even though I agree with you about the most likely scenario, I'm going to ask all the questions, and keep option open, until there's enough evidence to call it.