If I recall correctly, I don't think the Amy's employee knew her. However, he did create a bit of a catch-22 when he walked her home and that guy ran into her. He probably decided to do the good thing and walk her home, but to hand her off to someone, even if they claimed to know her, was a bad idea. The part we'll probably never know for sure is if she indicated that she knew the person who approached them. That is what a lot of this hinges on.