Superiors sent Rendu postulants and young Sisters to train. They put in her house, for a period of time, Sisters who were somewhat difficult or fragile. To one of her Sisters in crisis, she gave this advice one day, which is the secret of her life: "If you want someone to love you, you must be the first to love; and if you have nothing to give, give yourself." As the number of Sisters increased, the charity office became a house of charity, with a clinic and a school. She saw in that the Providence of God.