Oh that Eryka! (SPOILERS S2 E6-7)
Ach!
Suspected all along she was a wrong'un! (Then reinforced by Karl's usually unerring judgment in interview rooms when he refused to believe her, and Elise did).
Must be those steely glares and dead shark eyes. Oh, and the original fact that she trumped up a reason NOT to get on that plane! Had her right there, ta da.