*Spoiler* Was expecting a twist...
...with the gun at the end. I was expecting the gun to turn out to be a fake when she tries to fire it, because this gun was from the "patient" of hers who was part of the con gang (which would go on to use fake guns twice in the whole con). I thought this would have been in line with the modus operandi of the con gang.
So, why did this patient guy give her a real gun? To make him look authentic as a patient who wanted to kill himself? Wasn't it too risky to let a woman, who apparently didn't have any experience with a gun, keep it? It seems out of character that a group of con men would take such a risk given that they wanted to avoid violence of any kind.
Also, why did she not confront the patient regarding the lie he told her about how much he owed Mike? The minute Mike told her that this patient guy owes him only $800 and not $25k, she as a psychiatrist should have started thinking why the patient exaggerated the amount.