She was born circa 1752. Her father was Jose Valentin de Olivares, and her mother was Maria de Jesus Guajardo. Her father owned Mier 19 grant.
She married Juan Eligio Casas, son of Juan de las Casas and Josefa de la Garza. He owned Camargo 39 (tract). His father owned Camargo 29 grant, Camargo 39 grant.
Maria Leonarda Casas, born 1774.
Maria Josefa Casas, born 1778.
In 1782, she lived in San Juan Bautista del Cojo in household number 130. The church census recorded that she was married, casta, and 30 years old. Her household included 4 people:
Juan Eligio Casas, married, casta, age 33.
Maria Rosalia Olivares, married, casta, age 30.
Maria Josefa Casas, a young child, casta, age 4.
Maria Leonarda Casas, a young child, casta, age 8.