Here is all we know for sure. These are the hard facts. Correct me if I'm wrong.
1) She went to an area she had gone to before.
2) She made a 911 call saying she had car trouble.
3) First reports after she disappeared had several conflicting versions of the 911 call, including that she did not call.
4) The trooper who arrived on the scene did not call for a tow truck nor do anything else that involved creating a report of some kind.
5) We don't know how long the trooper was on that call nor when his next call was.
6) We don't know if there was some mechanical issue with the car that would cast doubt on the trooper's story.
So again, people are willing to invest so much energy in looking for a suspect, but when it comes to the slightest hint of investigating the most obvious person who should be looked at it becomes a comedy.