[2] Her parents were Luis Felipe Haza González, a Cuban immigrant from Matanzas, and Rita Indiana del Castillo y Rodríguez-Objío.

[4] Haza studied in the Conservatoire of Santo Domingo and debuted on 13 March 1958 as a singer,[5] performing at the Instituto de Señoritas Salomé Ureña, arias from Handel's Messiah,[6] in a chamber concert celebrated in the presence of Rafael Trujillo.

[3] Haza's repertoire covers all the genres of vocal music, including opera, operetta, works with orchestra and songs.

[3] With the National Symphonic Orchestra of the Dominican Republic she collaborated with Dominican conductors Manuel Simó [es], Carlos Piantini, Rafael Villanueva, Manuel Marino Miniño, and José Antonio Molina, and with guest directors such as Roberto Caggiano, Carlos Chávez, Enrique García Asencio, Paul Engel and Robert Carter Austin.

[3] Haza sang works by Maurice Ravel, Heitor Villa-Lobos, Lukas Foss, José of Jesús Ravelo, Leo Brouwer and Enrique of Marchena, among others.

[4] She was second cousin of banker Alejandro Grullón as the both of them were great-grandchildren of Manuel Rodríguez Objío and his wife María del Rosario Ravelo.