She was a staff nurse in Pembroke Nursing Home, Dublin until 1936, and was a private nurse until 1940 until she entered the
Medical Missionaries of Mary She had responsibility for the treatment administration, which was injections of
chaulmoogra oil, which was not a cure for the disease but a treatment for some of the symptoms. For her first few days there she taught basic nursing skills to the small group of boys who spoke English and they became her staff. Her fellow sisters were in charge of the practical day-to-day life. By the end of 1945, a routine service was established in the region and wider region. After this the sisters planned to open a similar service at
Abakaliki, and a second unit at
Obudu, near the Cameroun mountains. Gogan and Sr M. Brigid Kavanagh were assigned to Abakaliki. In the following years, she was involved in the foundations of a number of general and maternity hospitals at Obudu, Ikom,
Nkalagu and nDubia. She had been due to return home to Ireland for leave at the outbreak of the
Nigerian civil war on 6 July 1967, but she chose to stay with her sisters until the battle front moved on from Ogoja diocese and the medical services were restored. She continued this work until 1969, when she was not physically fit enough to continue with missionary work. Gogan returned to Ireland in June 1969, where she became sister superior at Airmount Maternity Hospital,
Waterford for five years. ==Death==