Personality Disorders Support Group
Personality disorders form a class of mental disorders that are characterized by long-lasting rigid patterns of thought and behaviour. Personality disorders are seen by the American Psychiatric Association as an enduring pattern of inner experience and behavior that deviates markedly from the expectations of the culture of the individual who exhibits it.
First thing you can do for you friend is gently tell her she needs help if that fails ask police to do a welfare check and tell them your fears for your friend don't get her to attack you , you could come of worse please don't