From 1891 to 1910, she was engaged in the teaching profession in
Brussels, Belgium, at Essen-on-the-Ruhr, and at
Bielefeld,
Westphalia. Since 1910, she occupied herself with social service and temperance work in Bielefeld. Lohmann became actively identified with the struggle against alcoholism in Germany in 1904, when, upon the organization of the Society of Abstaining Women Teachers () she became a member of that society, of which she served for fourteen years (1910–24) as president. In 1905, she affiliated herself with the German League of Abstaining Women (), and later acted as second president of that organization. Since 1919, she was one of the leaders of the German Central Organization for Temperance Instruction (), and since 1921, a member of the Committee for the Prohibition of Alcohol () and director of the Bielefeld branch office. In 1924, she became second president of the German League of Abstaining Educators () and business manager of the International Teachers’ League against Alcoholism (). At the International Convention of the
World League Against Alcoholism, held at
Toronto, Canada, in November 1922, Lohmann testified of her work among German teachers in furthering scientific temperance instruction in that country. In connection with the work of the German
Woman's Christian Temperance Union (WCTU), which organization she represented at the convention, she stated that the campaign for temperance instruction in the schools of Germany was inaugurated during the opening years of the twentieth century and that, in spite of opposition on the part of the German Government, the work had been steadily progressing. Lohmann was also a delegate to the Sixteenth International Congress Against Alcoholism, held at
Lausanne, Switzerland, in August 1921. ==Selected works==