Why is this the climax of the play sorry wrong number lines 850 to 871?

In the climax of "Sorry, Wrong Number," lines 850 to 871 reveal the protagonist, Mrs. Stevenson, realizing that the murder plot against her is real and imminent. This moment is critical as it heightens the tension and desperation, showcasing her helplessness and isolation. The dramatic irony intensifies as the audience understands the gravity of her situation while she struggles to grasp the reality of her impending danger. This revelation serves as the turning point, leading to the play's tragic conclusion.