For now, I will say this. I no longer like the theory that she may have checked into a hotel before the crash. I agree with Fred at this point, that she was on her way to Bartlett. I think her plan was to stay a night or two. I also believe she left on foot shortly after the accident and continued East down 112, where she was seen by Rick Forcier about a half hour later near the intersection of 116.
If this is what she did, it increases the time she was alone. The probability that a bad guy happened upon her then is not so astronomical anymore. It's about 16 miles from the scene of the accident to the next town, Lincoln. At this point, I think she was picked up somewhere in the quiet distance between.