She was born circa 1779. Her father was Jose Vicente Saenz, and her mother was Maria de San Juan Guajardo.
In 1782, she lived in San Pedro de las Flores in household number 75. The church census recorded that she was a young child, española, and 3 years old. Her household included 4 people:
Jose Vicente Saenz, married, español, age 29.
Maria de San Juan Guajardo, married, española, age 25.
Maria Antonia Saenz, a young child, española, age 3.
Jose Melchiades Saenz, a young child, español, age 1.