She was born circa 1779. Her father was Jose Nicolas Garcia, and her mother was Maria Ana Flores.
In 1782, she lived in Mier in household number 18. The church census recorded that she was a young child, española, and 3 years old. Her household included 4 people:
Jose Nicolas Garcia, married, español, age 24.
Maria Ana Flores, married, española, age 23.
Maria Rosalia Garcia, a young child, española, age 3.
Jose Manuel Garcia, a young child, español, age 3.
In 1791, she lived in Mier in household number 19. The church census recorded that she was a child, española, and 10 years old. Her household included 4 people:
Jose Nicolas Garcia, a widower, español, age 33.
Maria Rosalia Garcia, a child, española, age 10.
Jose Manuel Garcia, a child, español, age 9.
Jose Antonio Garcia, a child, español, age 4.