In 1910, she became the first woman in Denmark to work as a factory engineer, inspecting the premises of bakeries in Copenhagen until she retired in 1939.
On receiving the necessary qualification, she worked as a schoolteacher before entering the Polytechnic Teaching Institute in 1896, qualifying as Denmark's first female factory engineer in 1901.
In 1903, she married the medical doctor and Olympic tennis player Jørgen Arenholt (1876–1953).
In 1910, she succeeded in obtaining the newly created post of factory inspector at the Directorate for Labour and Manufacturing Control (Direktoratet for Arbejds- og Fabriktilsynet), where she was responsible for checking out bakeries and pastry shops in the Copenhagen area.
[1] On the political front, her lifelong interest in economic and social conditions began in 1907 when she was one of the founders of the women's suffrage association Landsforbundet for Kvinders Valgret, editing their journal Kvindevalgret (Women's Right to Vote) from 1908 to 1912.