Unlucky, really shitty thing to do to a punter and deserves a bad reputation for it. Shame, she looks seriously hot.
You may have been bumped, maybe had more than one being strung along and it was your unlucky day. Being that you were on the phone to her and were so close I'd say she was looking out for you and binned out at the last moment. As Zeus says, I hate it when they try to talk you through directions to the door.