Why does Mrs birling react in a frightened way The inspector calls?

Mrs. Birling reacts with fear during "An Inspector Calls" because she is confronted with the consequences of her actions and the potential exposure of her family's secrets. The Inspector's probing questions threaten her social status and the carefully constructed facade of respectability she maintains. Her panic stems from the realization that her authority and control are being undermined, as well as the fear of scandal that could tarnish her family's reputation.