Your thoughts about the men walking their dogs are intriguing. I don't know what to make of it, but there could be something there.
All the records, (credit card, etc), had been checked. She surfed websites for Amtrak and the airlines but no ticket was purchased. Her parents had confirmed this at the time.
Her e-mail to them on May 1st said that she was still undecided about how she was getting home and when exactly she would be there and that she would let them know.