In the short story, "The Necklace," by Guy de Maupassant, why is Madame Loisel anxious to hurry away from the ball?

    Madame Mildred Loisel finally gets her chance to mix with high society at the Ministry of Education ball in Guy de Maupassant's short story, "The Necklace." She "was a great success... prettier than any other woman present." She finally leaves the ball at 4 a.m., after awaking her husband, who is napping in the deserted anteroom. Although it is the most memorable night of her life, she now wishes to leave quickly after her husband covers her from the cold, night air with

... the wraps he had brought, the modest wraps of common life, the poverty of which contrasted with the elegance of the ball dress. She felt this and wished to escape so as not to be remarked by the other women, who were enveloping themselves in costly furs.

The couple eventually hail a cab,

"one of those ancient night cabs which, as though they were ashamed to show their shabbiness during the day, are never seen round Paris until after dark... All has ended for her.

But when they arrive back home, Madame Loisel realizes that her borrowed necklace is missing. The hardships that follow make her night of ecstasy a distant memory.