Why does lady Macbeth emphasize her own determination to persuade kill the king?

Lady Macbeth emphasizes her own determination to persuade Macbeth to kill the king to assert her power and influence over him. She wants to show that she is not just a passive bystander but an active participant in their quest for power. By taking the lead and encouraging Macbeth, she reinforces her role as an equal partner and demonstrates her strength and ambition. This emphasis on her determination also serves to show her own character development, as she becomes increasingly ruthless and driven by her desire for power.