Why do the murders of Lady Macduff and her son affect Lady Macbeth, when she seemed emotionally

unaffected by those of Duncan and Banquo?

Immediately after assassinating King Duncan, Macbeth enters the stage and is visibly shaken by the entire affair. Macbeth looks at his bloody hands and tells his wife, "This is a sorry sight." Lady Macbeth demonstrates her resolute, composed disposition by telling her husband, "A foolish thought, to say a sorry sight." Macbeth proceeds to reveal his tortured mind by asking Lady Macbeth why he could not utter "Amen" in Duncan's chamber, which reflects his guilt and remorse. Lady Macbeth responds by advising her husband to dismiss his troubled thoughts and control his emotions. However, Macbeth continues to elaborate on his auditory hallucinations by telling his wife that the chamberlains said

Lady Macbeth responds by criticizing her husband's masculinity and instructing him to wash the blood from his hands while she places the daggers back inside Duncan's chamber. When the couple hears someone knocking at their door, Macbeth once again ...