Given our understanding of psychology, we can confirm that Diana may be diagnosed with Dissociative identity disorder.
Dissociative identity disorder is a mental illness that, until recently, was known as multiple identity disorder. The root cause of this illness remains unknown, despite it having been studied much more intensely in recent years. Some scientists believe the appearance of this illness can be triggered by mental trauma, as a sort of defense mechanism in the brain.
For these reasons, we can know that since Diana exhibits two separate personalities, each well-defined with distinct characteristics, which is a key characteristic necessary for diagnosis, she may be diagnosed with Dissociative identity disorder
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