Why is Antoinette from tale of despereaux disappointed in her son?

Antoinette is disappointed in her son, Despereaux, because he does not conform to her expectations of what a mouse should be. Instead of being cautious and timid like typical mice, Despereaux is adventurous and brave, which she perceives as a flaw. Her disappointment stems from her desire for him to embody the conventional traits of their kind, leading her to feel alienated from him. This conflict highlights the themes of individuality and societal expectations in the story.