Agnes Haehnlein, the only child of her German-born parents, was born at Conception, Missouri on February 29, 1872. The date of her birth seemed to indicate that she would be an 'exceptional' child, and she truly was. She entered our convent at Clyde on March 9, 1891, and was invested on May 30th of the same year. On June 21, 1892 she was professed as Sister M. Frowina, and made perpetual vows on February 14, 1898.

Sister was of a refined, intellectual type. She taught at the Academy for many years, and served as Principal much of the time, practically alternating with Sister M. Dorothea Keyes. Kind and gentle, though firm in discipline, she was much loved by the pupils and exerted a strong influence for religious vocations among them. After retiring from teaching in 1917, she spent some ten years at the Chewelah foundation, where she was Superior part of the time. When Chewelah was closed, she was sent to join the newly formed Mundelein community, and later on was stationed at the Kansas City priory for a time.

During the last twenty months or so of her life, Sister was bedfast in the Clyde infirmary. A victim of arthritis, she became completely helpless in time, unable to turn the least or to stretch her limbs. 

A Sister who attended her almost constantly said that she never showed the least irritability, never said an unkind word, was always patient and gentle. Though never without discomfort and pain, she did not complain. 

She often said: "From 6:00 to 7:00 is my joy hour, for then I can go to Mass and receive Jesus." When no longer able to be taken to the chapel she felt the privation of Mass keenly, and later, also the reception of Holy Communion. 

Expressing sympathy for her in her sufferings, a Sister once exclaimed: "Poor Sister!" but she immediately answered: "I am not poor! I am the spouse of Jesus!" Another time when someone said to her, "You are suffering much this morning," she answered: "Yes, but I am glad to suffer for my Jesus." There were many beautiful prayers which she knew by heart from frequent repetition. Among her favorites were the Little Flower's Prayer to the Holy Face, and the Litany of the Sacred Heart. When someone who was praying the Litany with her inadvertently skipped an invocation, Sister would quickly supply it.

Death came as a welcome visitor on September 16, 1950 when Sister was seventy-eight years old.