Well, Anna is a bit messed up, to put it mildly. You may find out why in the future. For now, I'll just say that Abnormal Psychology is her life's work.
Ardra finds her friendly yet somewhat distant approach infinitely superior. She does believe in positive reinforcement, at least.
And Eileen and Lenore both have their ways of getting on Ardra's nerves. Eileen is just far more subtle about it.