Her cause for sainthood commenced on 27 September 1975, under Pope Paul VI, and she became titled as a Servant of God; while the confirmation of her life of heroic virtue allowed for Pope John Paul II to name her as Venerable on 23 October 1987. Martillo was beatified on 25 October 1992, after the approval of a 1967 miracle, while the confirmation of a 1992 miracle allowed for Pope Benedict XVI to canonise her on 12 October 2008 in Saint Peter's Square.