what incident shows the contrast between Madame Loisel’s apparent situation in life and her true situation?

what incident shows the contrast between Madame Loisel’s apparent situation in life and her true situation?
In the short story, “The Necklace”, at the reception, what incident shows the contrast between Madame Loisel’s apparent situation in life and her true situation?.

what incident shows the contrast between Madame Loisel’s apparent situation in life and her true situation?