She was born circa 1760. Her father was Francisco Guerra, and her mother was Ana Josefa de la Garza. Her father owned Porción 66, Mier. In 1782, she lived in Mier in household number 36. The church census recorded that she was an unmarried girl, española, and 22 years old. Her household included 8 people.
Maria Tomasa Guerra, born 1783. She was a natural child.