Critique: "Lying"

In “Lying,” the narrator, Jacqueline, is being held in a mental hospital, convinced that she is being held as a sex slave. She hallucinates her former lover and friend, Donna, and believes that Donna is attempting to help her escape. We only find out that Jacqueline is in a hospital at the end of the story, when she is tackled by an orderly (man in white) and given a sedative injection. I liked the backstory scenes a lot more than the present-tense hallucinatory scenes. I felt like they were more vivid and meaningful, so maybe that’d be a good place to open up the story. It appears that Jacqueline’s fate is sealed within the mental hospital, so why tell that part of the story?