She had great devotion for Jesus in the Blessed Sacrament. Between 1673 and 1675 Our Lord appeared to her during several occasions and revealed the 12 promises for those who practiced a true to devotion to His Sacred Heart, whose crown of thorns represent his sacrifices.
Thanks to the revelations in those promises, Catholics have grown in devotion to the Sacred Heart and they have gained many spiritual rewards through the devotion of the Nine first Fridays.
Her heart and brain are still incorrupt.
Work of God Apostolate
Saint Margaret Mary Alacoque