In the story 'By Any Other Name', the reaction of the girls' mother to their leaving school is one of intense fear, characterized by uncontrollable sobs and a deep sense of concern for their wellbeing.
When asked about the reaction of the girls' mother upon learning why they have left school in the story "By Any Other Name", the mother reacts with intense fear. This is evident from the emotional turmoil described through the mother's uncontrollable sobs and the motionless posture, indicating a deep sense of dread and concern for her children's wellbeing.
Such a reaction suggests that the mother understands the gravity of the situation and is overwhelmed by the implications it may have for her daughters' future.