Starting with simple planning of the children's daily lives and helping the children with their homework, she graduates to assigning household chores, and even attending school meetings in place of the parents. Thus Lisa slowly takes over the role of mother. As she wins the children's trust and dependence, the real mother becomes quite anxious.
從簡單的規範小孩生活起居，協助、監督小孩做功課，到指導小孩做家事，甚至代替父母出席學校親子座談會，麗莎逐漸取代了母親的角色，在贏得孩子信任依賴的同時，也不時引起母親的莫大焦慮。