Mary Monica Coupe was better known as Sister Mary Eucharista. She served the Maryknoll Sisters and was transferred from the Philippines to Hong Kong in 1935.
During the Japanese invasion, she resided in the convent in Holy Spirit School on Caine Road. After the fall of Hong Kong, the Sisters at the convent worked at Queen Mary Hospital to help care for the wounded. On 21 January 1942, Sister Mary Eucharista and her group of Sisters from Hong Kong Island were interned at Stanley Camp. In camp, she worked in the library.
In September 1942, Maryknoll missionaries were released from confinement (see here). However, Sisters Mary Eucharista and Mary Christella preferred to remain in camp for a bit longer so as to continue the spiritual instruction of camp internees and engage in social service work. Around 1944, she left Hong Kong and worked in the inland missions of China. In 1945, Sister Mary Eucharista together with Sisters Mary Dorothy and Mary de Ricci made their way to India. They would return to Hong Kong in 1946.
Sister Mary Eucharista later taught secondary school students at Maryknoll Sisters School, Blue Pool Road. She left Hong Kong in 1964.
Source
1. Maryknoll Mission Archives: https://maryknollmissionarchives.org/deceased-sisters/sister-m-eucharista-coupe-mm/
2. The Maryknoll Sisters in Hong Kong. See here
3. The Diaries of the Maryknoll Sisters in Hong Kong, 1921-1966. See here
4. Catholic News Service - Newsfeeds dated 16 March 1943. See here