She was so narcissistic and so awful in terms of how manipulative she was, but at the same time, it was so wonderful.
According to psychiatrist Robert Reich, M.D., compulsive lying can be associated with diagnoses such as antisocial personality disorder, borderline personality disorder, and narcissistic personality disorder.
Compulsive lying comes into play with the Narcissistic Personality Disorder when the individual exaggerates his/her experiences and/or achievements to demonstrate to others how superior he or she is.
Maladjustments of personality, including conduct, paranoid, narcissistic, avoidant, dependent, and obsessive-compulsive personality disorder (not to be confused with the anxiety disorder OCD).
Being able to lie easily and often may be a symptom of a recognized personality disorder, such as Narcissistic Personality Disorder or Borderline Personality Disorder.