My suspicion lies with Cassie being the one to feed her just enough info....such as, ask him what his ex-girlfriend would have to say about him.
I also keep thinking that Arie is there because Cassie thought they would make a good couple. Kind of like, "Arie, I think you and Emily would be a great match. Why don't you do the show this time?" She just failed to tell Emily about her and Arie's connection.