I have met and worked with a lot of people who
claim to be multiples. Multiple personality disorder is a therapeutic cash cow ... you can keep a patient coming back to you nigh onto forever to work on "integrating". Instead of doing so, the therapist will discover more and more and more personalities, at least until she stops being able to pay for sessions.
I'm not saying she doesn't seem to change, or isn't convinced that this is happening.
Reading this may explain things better than I am able right now.