In 1925, Coward received a Rockefeller Fellowship to continue her studies and research on vitamin A in the Department of Agricultural Chemistry at the University of Wisconsin&ndash;Madison under Dr. Harry Steenbock. On her return to Britain, she was appointed head of the Nutrition Department of the Royal Pharmaceutical Society's pharmacological laboratories, the position which she remained until her retirement in 1950. In 1937 she was elected as an honorary member of the Pharmaceuticals Society.