She was born circa 1788. Her father was Juan Manuel Guerra Cañamar, and her mother was Maria Isabel Treviño.
She married Francisco Antonio Montalvo, son of Antonio Montalvo and Maria Petra Salinas on 17 Feb 1806. She was 18 years old. He owned Las Vivoritas (tract). His father owned Mier 54 grant.
In 1791, she lived in Mier in household number 31. The church census recorded that she was a young child, española, and 3 years old. Her household included 12 people:
Dn Juan Manuel Guerra Cañamar, married, español, age 49.
Da Isabel Maria Treviño, married, española, age 39.
Jose Francisco Guerra Cañamar, single, español, age 14.
Antonio Matias Guerra Cañamar, a child, español, age 13.
Maria Tomasa Guerra Cañamar, a child, española, age 11.
Jose Ysidoro Guerra Cañamar, a child, español, age 10.
Maria Segunda Guerra Cañamar, a child, española, age 8.
Jose Antonio Guerra Cañamar, a child, español, age 6.
Jose Mateo Guerra Cañamar, a child, español, age 5.
Maria Encarnacion Guerra Cañamar, a young child, española, age 3.
Juan Jose Guerra Cañamar, a young child, español, age 1.
Antonia Rita Guerra, a child, india, age 10.