Sandra is a 25-year-old soldier hospitalized for sudden changes in behavior and episodes of apparently poor memory. She is confused about her recent history, and believes that she is in a different hospital located 800 miles from the place where she has in fact been admitted. It has been determined that for some years she has suffered significant gaps in memory. She also has significant, sudden changes in her expression of emotions and behavior - while Sandra is generally agreeable and helpful, she will suddenly become hostile and uncooperative. She reports being told that she has said and done things she vigorously denies because she has no memory of having done them. On one occasion she was admitted to the emergency department with a deep cut to her thigh, saying tearfully that she had been running in a field and fell. This explanation was both vague and inconsistent with the type of injury and the fact that she had been in the hospital. Sandra then calmly reported that her name was not Sandra but Mary and that she was the one that took out a knife and cut Sandra's leg "so deep that even I couldn't look at it." She said she was doing it to punish Sandra for letting herself be abused - "If I can't win, then she can't win." When asked whether she was afraid that she might die from blood loss, she said, "No, she'll take care of it. But even if she did die, I could get to be with someone else." When asked how that could be, she replied, "Why not? I got to be with her." At this point Sandra was referred to the psychologist on staff for a consultation.

1. If you were a psychologist seeing Sandra, what diagnosis would you give and why? (List and explain the diagnostic criteria from the DSM-5TR that you would use to justify your diagnosis.)

2. What treatment would you recommend? (Be specific about why you think your treatment would work best and CITE your source. The treatment plan should not be your opinion. It should be based upon research that has been done on what works well to treat this disorder. If you use an outside source, cite that as well