She is a Catholic saint; her veneration, which began immediately after her death, was approved by Pope Innocent XII in 1692.

[1] The Mercedarians had for time been involved in redeeming Christian slaves and captives held by the Saracens of Spain and North Africa.

One day she heard a sermon preached by Bernardo de Corbera, the superior of the Brotherhood of Our Lady of Ransom at Barcelona and was so deeply affected that she resolved to do all in her power for those held captive.

Mary de Cervellione continued to work at Saint Eulalia's, where the ransomed stayed once they returned.

She was credited, both before and after her death, with coming to the aid of ships in danger at sea so they might continue on course to safely deliver Christian prisoners.