Having read through the thread, I wonder if maybe a local was her killer, someone who overheard her conversation with the waitress at the truck stop, offered her a ride in the parking lot/ just past the station, took her to their place (which would have been relatively secluded from what I have gathered through the thread), where based on a time frame of her last being seen around 6:30 pm would have given him about 12 hours (if you subscribe to the notion she was killed around 3 am and then dumped sometime around 6:30am) to kill and transport her. the shoes being dumped with her would be because she went into killer's house with clothes on, but shoes off and left in the vehicle, and was transported without the clothes to the dump site. I'm kind of following an Occam's Razor approach here, as the area where she was found was pretty rural still at the time, and she was hidden enough car's may not have seen her while on the road, but pulling off or riding up in a semi cab could give you a view. One of may theories, I know, but not one I have seen discussed much.