It would've been awesome if she answered with "I'm sorry, I thought I had an appointment with my OB, not the RSO on duty."
Originally I had a great comeback which was for her to say "What color is your favorite dildo?" and then when the doctor looked confused/offended have her then say "Oh I'm sorry...I thought we were taking turns asking about shit thats none of our business."
..But we all know that any answer like that will surely fit the bill of someone who is "unstable."