Encouraged by her father, she studied medicine, becoming the first woman to enter medical school in 1891, at the University of Otago Medical School. Although the dean,
John Scott, was reluctant to admit Siedeberg, the university council decided that the school was open to men and women. The opposition Siedeberg faced was minor compared to that received by women trying to enrol in medical degrees overseas. Siedeberg's experience was made easier when she was joined in her second year by
Margaret Cruickshank. Siedeberg graduated from the
University of Otago Medical School in 1896. She did her post-graduate studies in obstetrics, gynaecology and children's diseases at the
Rotunda Hospital, Dublin, and in
Berlin. After postgraduate training and work experience overseas, she eventually registered as a medical practitioner and set up a private practice in Dunedin, with financial help from her father. She was appointed Medical Superintendent at
St. Helens Hospital, Dunedin, and served from 1905–1938. Dr. Siedeberg was active in community and welfare work. A founding member of the Dunedin branch of the
New Zealand Society for the Protection of Women and Children in 1899, she was president of the Dunedin branch from 1933 to 1948 and became honorary life president in 1949. ==Other activities==