While Rita continued to care for her sons, it became clear as they grew up that they were intent upon exacting revenge for the death of their father. Rita sought to persuade them otherwise, telling them that such a killing would be murder. She also prayed that they would not carry out their plans. Both sons died of natural causes within the year.
With her husband and sons gone, she was able to become a nun and entered the monastery of Saint Mary Magdalene at Cascia at age 36 and stayed there until her death in 1457. She was beatified by Urban VIII in 1627; she was canonized on May 24, 1900 by Leo XIII. Her feast day is May 22.
A large sanctuary of Saint Rita was built in the early 20th century in Cascia: it and the house in which she was born are among the most active pilgrimage sites of Umbria.