When Margaret was discharged from the hospital, Marie, being her best friend, came to see her. The two met and chatted about their daily lives, and of course, the topic gradually navigated itself to Lily.
Marie told Margaret that Lily had visited the hospital for a check-up. It was confirmed that she was pregnant, thereby giving Margaret the greenlight to start foiling her plan. Margaret was undoubtedly elated to hear this news. It was a good thing for the Myers family to have many descendants, but the only problem was that she'd need to deal with Edric. She realized that in that aspect, she couldn't rush things and had to take her time.
Margaret made Marie promise to keep it a secret for now. She needed Lily to take good care of herself for the time being. When the time was right, she would break this news to Edric. If everything between Lily and Edric were to unfold smoothly, Margaret would only need to think of a way to get rid of Irene.