What reprise is sung by Diana in Act 2, Scene 7? What conversation takes place between Diana and Dr. Madden in this scene?

Diana, in conversation with Dr. Madden, sings of not knowing or understanding what's happening to her or how her memory is working - a reprise of "You Don't Know," only this time it's "I Don't Know". As she sings of how difficult it is to get Dan to talk, Madden's reference to Gabe stops both the song and the conversation cold.