JCO:Passions and Meditations

I am reading Joyce Carol Oates'  short story Passions and Meditations and it seems to me that the story is a case study of some sort of mental illness.  I noticed hints of multiple personality disorder and what might be schizophrenia but I am not sufficiently familiar with psychology to know what mental disease is described.  Would someone who is more familiar with mental illness be able to tell me which mental illness is portrayed in Passions and Meditations?

 

Thank you

 

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