Answer: Distributing leaflets
Thinking his mother safely ensconced at the hairdressers for an hour, Luc has gone to meet his grandmother at their regular rendezvous in the shop. However, Caroline has promised Le Comte to distribute leaflets throughout the town protesting the rising immorality he perceives in the town. Their text reads, "Boycott immorality. Our beloved village rests upon a solid foundation of Family, Church and Community. To keep Lansquenet safe and tranquil, we must close our doors to outsiders whose only tradition is self-gratification, whose only creed is godlessness, and whose only possible effect is the moral contamination of our village. We must give these outsiders no quarter! We must make them unwelcome in our homes, on our streets, and in our places of business. Thank you for your cooperation, Lansquenet Town Council", but they are part of his personal vendetta. Caroline is going past the shop (she clearly didn't expect Vianne to post a leaflet protesting against her own presence) when she spies her son and mother together, and comes rushing in. This is when we find out that Armande suffers from diabetes, making her consumption of chocolate not only self-indulgent, but also reckless. Caroline's wish for her go to an institution where she will receive proper medical care, frustrated by her insistence on remaining independent, is a significant part of the estrangement between the two.