Emilia's suspicions

In act 4, Scene 2, Emilia tells Desdemona that "I will be hanged if some eternal villain...to get some office,/Have not devised this slander." Does she realize Iago's plan, since she says that someone devised this plan to get some office (position). If so, is she giving Desdemona a big clue here by saying it? Or does Emilia not realize that Iago is creating this exact plan she is thinking of?