Her mother died in 1838 and she took up much of the domestic chores as a result of this while an elder sister and teacher taught her to read and write as well as to sing and use the guitar; she also learned how to sew and cook. The girl also turned a small room in her house into a domestic chapel. She received her Confirmation on 16 September 1839. Martillo frequented a small wood near her home for contemplation in solitude, while the guava tree near which she went to is now a large pilgrimage destination. The girl also chose the then-Blessed Mariana de Jesús as her patron with whom she identified and strove to imitate in her own life. Martillo was known for being sweet and thoughtful with a peaceful and generous disposition; she was obedient to those around her and was well-known and loved in her village. Martillo was blonde with bright blue eyes and was strong and agile; she was also tall.