Sasha's husband insisted that she go to a mental health clinic when she was unable to explain or remember her frequent absences from home, phone calls from people that she claimed she had never heard of, and check stubs from checks that she couldn't remember writing. at the clinic, sasha admitted there were long stretches of her life that were completely blank to her. suddenly, sasha's voice, facial expression, and demeanor changed, and she said to the clinic psychologist, "don't pay any attention to that old sasha. she's just a bore. my name is simone, and i'm a lot more fun to talk to." the clinic psychologist suspects that sasha may be suffering from:

The clinic psychologist suspects that Sasha may be suffering from Dissociative identity disorder (DID).

Explanation:

Individuals suffering from Dissociative identity disorder (DID) have two or more distinctive and somewhat persisting personalities. This mental disorder is also characterized by memory gaps that occur, in particular, because one personality is not aware of the experiences of another personality.

Meanwhile, existing personalities might be aware of each other, or like in Sasha’s s case only one personality (Simone) has this awareness. The Dissociative identity disorder (DID) is widely explored in cinematography, for example, in the Split (2016).