Upon her death the cities that she had dwelt in came to revere and acclaim her as a saint while the Dominican nuns she had lived with preserved her remains at their Peru convent. The cause for her canonization later commenced with the beginning of the informative process tasked with collecting documentation from 26 September 1961 until the process was closed on 10 July 1962 at which stage her writings received theological approval on 8 July 1965. The officials in charge of the cause sent a large Positio dossier to Rome to the Congregation for Rites for investigation before historians approved the cause on 8 May 1974. The formal introduction to the cause came under Pope Paul VI on 27 September 1975 and she became titled as a Servant of God as a result. Theologians met to discuss the cause on 24 July 1984 but did not come up with a clear consensus and so met again on 20 December 1984 where the group approved the cause. The members of the Congregation for the Causes of Saints approved the cause as well on 16 June 1987. Martillo became titled as Venerable on 23 October 1987 after Pope John Paul II acknowledged the fact that she had lived a model life of heroic virtue.