She was born circa 1750. Her father was Tomas de Cuellar, and her mother was Maria Inez Martinez.
In 1782, she lived in Mier in household number 14. The church census recorded that she was married, española, and 28 years old. Her household included 4 people, one of whom was likely a servant:
Miguel de Alegria Lazcano, married, español, age 60.
Ana Maria de Cuellar, married, española, age 28.
Jose Miguel de Alegria, a young child, español, age 3.
Maria Dolores de Alegria, a young child, india, age 5.