She immediately had the idea that her action was required in order to make them come true, and so she prayed for the ruthlessness needed to do so.
She pushes MacBeth to kill the king and by doing so fulfills the witches predictions.
Macbeth kills King Duncan because he is manipulated and influenced by the witches' prophecies, particularly the prediction that he will become king. While the witches' predictions play a role in triggering Macbeth's ambition, ultimately it is his own choices and actions that lead to Duncan's murder.
Macbeth heads home to prepare his household for a royal visit. But he first sends a letter ahead, to give his wife the news of the witches' predictions. He shows up not too long after Lady Macbeth finishes reading his message [Act 1 Scene 5].
MacBeth meets the three witches with lady MacBeth
Lady Macbeth echoes the words of the witches when she says "All hail, Macbeth, that shalt be king hereafter!". This echoes the witches' prophecy that Macbeth will become king.
Macbeth is inclined to wait and watch the prophecy come true by itself. Lady M sees the prediction as a call to action, commanding her to incite Macbeth to murder the king.
Lady Macduff and her son were killed by Macbeth's murderers. He killed them because he was really afraid of everything (after witches' predictions) and wanted to harm Macduff.
same evil ideas
After MacBeth receives the predictions from the witches he writes a letter to Lady MacBeth detailing the whole situation. He calls her his "dearest partner of greatness" and is very trusting of her. He is also subject to much influence from her since she is the one who later convinces MacBeth to kill the king, Duncan, when he is resolute on not doing anything of the sort.
The letter of Macbeth was important to Lady Macbeth. It reinforced for her that the two worked together as a couple. Her husband confided in her, and respected and depended upon her advice and guidance. He didn't just tell her that they'd have the honor of King Duncan I as their house guest at Inverness Castle. He also updated her on his interactions with the three witches and their predictions of ever greater things for him on the job. Because she was warned in advance of the visit and of the predictions, she could prepare her household for her guest and her victims.
The witches only gave Macbeth prophecies. It was his decision to do so after Lady Macbeth persuaded him. Although the witches' intentions was probably to cause this murder, the witches did not make Macbeth muder Duncan.
yes because macbeth tells her