One of the older boarders at #5 St. Mary's Court was Almaide Duchemin. On July 2, 1829 when Sister Mary Lange, Sister Mary Frances Balas, Sister Mary Rose Boegue pronounced the vows, Almaide became the fourth member.

Gifted and well-educated, Almaide (Sister Mary Theresa) was personally accepted by Father Joubert to be one of the original four Oblates. He and Mother Mary Lange showed great interest in this young Sister. Both felt she had much to offer the community.

Her mother, Mrs. Betsy Duchemin, also became an Oblate. In the summer of 1832, cholera raged in Baltimore and Sister Anthony (Betsy Duchemin), nursed many of the victims including Archbishop Whitfield. Sister Anthony contracted the disease and did not have the strength to recover. In his diary, Father Joubert calls her a martyr to her charity.

In 1838, Mary Lange was re-elected Superior. There seemed to be a difference of opinion as to who should become her assistant. The choice was between Sister Mary Theresa and Sister Chantal Noel. The decision was made by Father Joubert. Sister Chantal became assistant. On June 24, 1841, Sister Mary Theresa Duchemin was elected Superior General. As Superior General, she introduced the custom that the Sisters greet each other by saying "Praised be Jesus and Mary" with the response: "Now and Forever." Sister Theresa also introduced the custom of feeding at least one poor person daily.

Mother Theresa held office from June 24, 1841. There was no regular election in June of 1844, but in December of that year there was a general election. Archbishop Eccleston presided. Mother Theresa was not re-elected. Instead became Mother Assistant to Mother Louise Noel. On September 9, 1845, Mother Mary Theresa (while still Mother Assistant) departed from the Oblate community. In her own words, she left "to be free to serve God as a true and accepted religious."

Mother Theresa's story is a tragic one. She was co-founder of one religious community (Oblates) to which she belonged for sixteen years; the co-founder of another religious community (Sisters, Servants of the Immaculate Heart of Mary), from which she lived apart eighteen years; member of still another community (Grey Nuns, Canada) where she found refuge during those eighteen years. In 1885, Mother Theresa returned to the Immaculate Heart Nuns and seemed to find a measure of peace until her death in 1892.

Her life was filled with trials and conflicts, due in large part to racial prejudice and bigotry. Her own personality, mystifying at times, coupled with consistently difficult circumstances, seemed to put her whole life in the shadow of the Cross.

So much about Mother Theresa is not understood, in her life-time and now. One thing seems certain. All her life Mother Theresa attempted to find God's Will. She persevered in her faith, living and dying a daughter of the Church. She was the co-foundress of two religious communities and member of a third. These communities continue to do the work of Christ.