She was also the founder of the Daughters of Saint Anne and assumed the new name of "Anna Rosa" after she had established her order and made her religious profession as a nun.

Custo received the sacrament of Confirmation at the age of twelve in the church of Santa Maria delle Vigne under Archbishop Placido Tadini.

She feared that her new path as a professed religious would force her to abandon her children and she asked for the advice of Francesco di Camporosso - a Capuchin friar.

[2] Custo established the Daughters of Saint Anne on 8 December 1866 in Piacenza and she assumed the habit in 1867; her religious profession was made with twelve new nuns on 8 April 1870.

[4][5] The beatification process commenced on 30 March 1937[6] and the opening of a diocesan tribunal in Rome conferred upon her the posthumous title Servant of God.

The recognition of her life of heroic virtue allowed for Pope John Paul II to declare her to be Venerable on 21 December 1998.