After the death of her husband in 1962, Agostini returned to Puerto Rico, where she continued teaching and wrote for local newspapers, particularly El Imparcial. In 1985 she founded the Museo de Reproducciones Artisticas in Bayamón, Puerto Rico. She was elected president of the Sociedad de Autores Puertorriqueños. She died at the age of 100 on December 11, 1996, in Spring Lake, New Jersey. He was buried at Kensico Cemetery in Valhalla, New York.
