Ethel Mattley was a missionary teacher and served the Churches of Christ in China. She arrived in Hong Kong in 1926 and would later continue her missionary work and Bible teaching in the Canton (Guangdong) and Kwangsi (Guangxi) missions. By 1940, Ethel Mattley returned to Hong Kong due to rising Sino-Japanese hostilities in South China.
After the fall of Hong Kong, she was interned at Stanley Camp and later repatriated to the United States in 1942.
Obituary/Memorial: https://www.findagrave.com/memorial/53887255/ethel-mattley
Source
1. The Field Is the World: A History of the Canton Mission (1929–1949) of the Churches of Christ by Stephen V. Crowder. See Google Book Preview here
2. South China Chimes November 1937 to September 1938. See here
3. The Stone-Campbell Movement: A Global History. See Google Book Preview here