Her father was Juan Fernandez de Castro, and her mother was Agustina Uribe de la Cadena Lobo.
She married Juan Cavazos, son of Antonio Cavazos de la Garza and Bernarda Rodriguez de Montemayor.
Onofre Cavazos. In 1733, he requested a dispensation to marry Maria Gertrudis de la Garza, daughter of Agustin de la Garza and Maria Josefa de la Garza.