Well, she hadn't known why she was expecting someone outside of the spectrum of wizards to know about all the nuances of magic. Though she notes that he is willing to believe in demons-- but thinks magic is waaay too far fetched an idea to consider.

She just continues to smile and shrugs,"I guess y'must be the expert then, Mr. 'Hunter'."

That tone means she's not buying it. Welp, no chance of dealing with whatever it was for now, and this guy certainly wasn't going to be helping her out any time soon.

She'll just be attempting to slip by you Dean.