She was born circa 1763. Her father was Diego Garcia, and her mother was Maria Gertrudis Salinas. Her father owned La Noria de Santo Domingo grant, Jim Hogg County, Mier 44 grant.
In 1782, she lived in Mier in household number 60. The church census recorded that she was an unmarried girl, española, and 19 years old. Her household included 8 people:
Diego Garcia, married, español, age 44.
Maria Gertrudis Salinas, married, española, age 42.
Juan Ygnacio Garcia, single, español, age 23.
Maria Antonia Garcia, an unmarried girl, española, age 19.
Maria Josefa Garcia, an unmarried girl, española, age 17.
Pioquinto Garcia, a youth, español, age 15.
Maria Juana Garcia, an unmarried girl, española, age 13.
Maria Gertrudis Garcia, a child, española, age 10.