Born in a Orthodox Jewish family, Minco worked at the Breda Courant in 1938. In May 1940, by order of German-minded commissioners, she was fired even before the Germans issued their anti-Jewish measures proclamation.

At the beginning of World War II she resided in Breda Amersfoort and Amsterdam. Minco got a mild form of tuberculosis and ended up in hospitals in Utrecht and Amersfoort. In the autumn of 1942 she came back to Amsterdam and her parents, which the German occupiers forced into the Jewish Quarter to live.

Later during the war, her parents, brother and sister were taken away and she became the only survivor, because she knew to escape arrest and spend the rest of the war hiding. Minco also got a new name: Marga Faes, of which the first name persisted. Minco was married to the poet and translator Breda Bert Feet (who died 1992) in 1938, with whom she was hiding. After the war, they worked at a number of newspapers and magazines. They have two daughters, one of whom is writer Jessica Feet.

In 1957 published her first book, The bitter herb, which the (nameless) character is going through war experiences reminiscent of the author's. The title of her second book was An empty house.