The Venerable Servant of God, Maria Carmen of the Most Holy Trinity (Civil name: Carmen Caterina Bueno) was born in Itu, in the State of São Paulo, Brazil, on November 25, 1898. Her parents were Teotônio Bueno and Maria do Carmo Bauer.

Shortly after Carmen was born, her mother, very young, had serious health problems. Little Carmen, therefore, had to move to Campinas, to be with her aunt, a widow who dedicated herself totally to Carmen’s education. The Servant of God spent her childhood in Campinas, and it was in this city that she also met Francisco Borja do Amaral, who was to become Bishop of Taubaté. In this period Carmen lived a little with her aunt and a little with her family.

In 1916, Carmen, along with her aunt, moved to Paquetá Island, Guanabara Bay. Later she entered Zion College in São Paulo and on September 23, 1917 she decided to dedicate her whole life to the Lord and to the Virgin Mary. From her youth she was distinguished by her great love for the Lord and the Church, at the same time she devoted much time to her studies; She spoke and wrote French perfectly, wrote small literary works and learned the art of painting.

The turning point of her spiritual life came after reading «A Story of a Soul» and it was then that she decided to become a Carmelite, like Saint Therese of Lisieux. On April 21, 1926, she decided to enter the Carmel of St. Joseph in Rio de Janeiro. She received the Habit on October 24, 1926 and chose to be called Sister Maria Carmen of the Most Holy Trinity as her religious name.

After her initial years in the Monastery, she exercised the office of Mistress of novices, sub-Prioress and finally Prioress Throughout this period she was known for her great humility. She was the first to undertake even the most menial tasks. She was the first to set an example of humility and patience to all nuns.

In 1949 she returned to being Mistress of Novices. It was the period in which her serious health problems began.

In 1952 she again was Prioress of the Carmel and it was at that time that the idea of founding a new monastery was born, the Carmel of the Sacred Face and Pius XII, which was established in the Diocese of Taubaté, where Monsignor Francisco Borja do Amaral was Bishop. It was August 24, 1953.

Six nuns left to accompany M. Maria Carmen, now Mother Carminha for everyone. Immediately the nuns were loved by the whole population, in particular the Servant of God was considered a saint by all. There were many people who asked to be directed spiritually by her.

On September 12, 1961, Mother Carminha gave up the leadership of the Monastery to Mother Antonietta Maria, as her health problems began to worsen seriously.

On July 13, 1966, the Servant of God had a holy death in the odour of sanctity.

The Diocesan Inquiry on the "life, virtue and reputation of holiness" was opened on February 7, 2010 and closed on November 10, 2012, at the diocese of Taubaté.

The decree on heroic virtues was promulgated on January 23, 2020.