How do you know that nothing really misses the eyes and ears of Madame Defarge?

In Charles Dickens' novel "A Tale of Two Cities," Madame Defarge is portrayed as a vigilant and observant character who is constantly aware of her surroundings. Her keen perception and attention to detail enable her to gather information and keep track of events unfolding around her. Through her strategic positioning in her knitting shop, Madame Defarge is able to discreetly observe and eavesdrop on conversations, allowing her to stay informed and maintain a position of power within the revolutionary group.