Possibly unpopular opinion, but I've always wondered if this was truly a random crime. This murder does seem to be particularly hateful, at least in my opinion. Maybe she was hitchhiking up until a certain point, which is when she somehow managed to establish contact with a person or people that she knew (and with whom she may have some sort of negative past history), and from there, that person or people ended up turning on her. Honestly, this seems unlikely compared to the theory that she was killed by a stranger who offered her a ride / picked her up, but you honestly never know.
Seems like hitchhiking was the thing to do for young people in the 1970s-early 1980s. many of the missing, unidentified, and victims of serial killers from that time period were hitchhikers. speaking of which this movie scene reminds me of walker. Teenager on the run, lying about her age, getting picked up by a trucker. (