What is lady macbeth's role in macbeth's plan to kill banquo and fleance?

Macbeth planned to kill Banquo and his son Fleance because of the second prophecy of the three witches. He didn’t want to take any chance which would leave him empty handed. He planned to kill his friend Banquo and Fleance by inviting them to a feast in his house. He asked his wife, Lady Macbeth, to look for all the arrangements essential for the feast to be the best one. He didn’t disclose his plan to her and asked her to look jovial and prove a very good host to the guests.