She was born circa 1760. Her father was Francisco Guerra, and her mother was Ana Josefa de la Garza. Her father owned Mier 66 grant.
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:
Don Francisco Antonio Guerra Cañamar, married, español, age 72.
Doña Ana Josefa de la Garza, married, española, age 60.
Maria Leonor Guerra Cañamar, an unmarried girl, española, age 42.
Jose Tomas Guerra Cañamar, single, español, age 25.
Maria de los Santos Guerra Cañamar, an unmarried girl, española, age 22.
Jose Silverio Guerra Cañamar, single, español, age 21.
Lucia Guerra, an unmarried girl, casta, age 20.
Julian Guerra, a youth, casta, age 14.