She made 3 attempts of suicide within 2 weeks. However, she reported that she had no plans to harm herself. Additionally, attempted episodic choking of her dorm mates, but does not remember those episodes. After her second attempt, she was considered as having DID with possible strong differential diagnosis of borderline personality disorder. After the third attempt she was admitted to female Psychiatry. 

Patient claimed having 2 personalities: ‘A’ is a good, disciplined, sociable polite person with respect of norms and values; whereas ‘M’ is violent, aggressive, impulsive and suicidal with no accountability for her action.
Childhood.
The patient claims that she had childhood full of trauma and incidents. During her altered state reported that she was not happy with her parents. She characterized her father as verbally aggressive towards her, she feared him excessively, and blamed him not preventing those sexual abuse attempts especially the first one. Even she stated that she doesn’t recognize her mother as her real mother but assumes her as grandmother explaining that she was brought up by her elder sister. 

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Şar, V., Dorahy, M. J., & Krüger, C. (2017). Revisiting the etiological aspects of dissociative identity disorder: a biopsychosocial perspective. Psychology research and behavior management, 10, 137–146. https://doi.org/10.2147/PRBM.S113743

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https://www.youtube.com/watch?v=ek7JK6pattE 

Some theorists suppose that personality is made up of “modes” (Beck, 1996). They contain of cognitive, affective, behavioral, and physiological schema for remembering the experiences. It is kind of a role, for example, a mode of “mother”, which can be activated when a person is caring for her child, and she will feel, think, behave as a “mother”. Normally all modes are unified into one sense of self. When modes are decoupled DID arises. As a result, multiple subpersonalities appear, and each one has its own sense of self. 

The theory states that if something is learned under the certain conditions, it will be remembered best when a person is again under the same condition. The explanation for this is arousal level, which is important for learning and memory. When the individual faces some situation at a particular level of arousal, he/she is more likely to recall the memories which are linked to it. This theory suggests that in patients with DID their thoughts, memories, skills are tied to a certain level of arousal, so they recall an event only when they experience the same state of arousal. 

Theorists concluded that dissociative disorders might be the forms of self-hypnosis, so people hypnotize themselves to forget traumatic experiences. Supporters of this theory suggest that children who experience abuse/trauma try to escape from the dangerous world by hypnotizing themselves; they mentally separate themselves from their bodies in order to avoid the traumatic event and to become another person.