I have always wondered about the time lapse between when Kelly got into his car and the time the phone call (assuming it was Kelly who placed that call), given the distance from point A to point B isn't that far, less than a half hour. I wonder if he drove around or took her to a location at or near Hussar (a house, garage, farm on the outskirts, abandoned out building, closed business) and she managed to escape and get to the phone.
Enigma, I agree, very likely someone local knows something that is pertinent. People in small towns notice everything. I hope that one day someone comes forward with the piece of the puzzle, as it has been nearly 30 years.