She was born circa 1768. Her father was Francisco Angel de la Garza, and her mother was Maria Cayetana Peña. Her father owned Mier 14 grant.
In 1782, she lived in San Andres del Arcabuz in household number 122. The church census recorded that she was a child, española, and 14 years old. Her household included 10 people:
Francisco Angel de la Garza, married, español, age 46.
Maria Cayetana Peña, an unmarried girl, española, age 39.
Maria Juana de la Garza, an unmarried girl, española, age 20.
Jose Marcelino de la Garza, a youth, español, age 18.
Maria Balbina de la Garza, a child, española, age 14.
Pablo Jose de la Garza, a child, español, age 12.
Juan Jose de la Garza, a child, español, age 10.
Maria Salome de la Garza, a young child, española, age 7.
Carlos Valentin de la Garza, a young child, español, age 5.
Jose Rafael de la Garza, married, español, age 1.