She was born circa 1788. Her father was Juan Manuel Guerra Cañamar, and her mother was Maria Isabel Treviño. 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.
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 grant, Jim Hogg County. His father owned Porción 54, Mier.