She was born circa 1778, and was baptized 13 Apr 1778 in Vallecillo. Her father was Manuel Peña, and her mother was Maria Gertrudis de la Garza.
In 1791, she lived in Mier in household number 33. The church census recorded that she was an unmarried girl, española, and 12 years old. Her household included 6 people:
Manuel Peña, married, español, age 43.
Maria Gertrudis de la Garza, married, española, age 39.
Maria Guadalupe Peña, an unmarried girl, española, age 12.
Jose Pablo Peña, a child, español, age 10.
Jose Guadalupe Peña, a child, español, age 7.
Juan Jose Peña, a young child, español, age 3.