Fehér was born in Újpest in 1919. She attended Budapest University from 1945 to 1948 and at the same time she wrote for a newspaper. In 1979 she became a freelance writer and wrote in a number of genres including work for children and books co-authored with her husband. She married László Nemes who was also a writer.

Fehér died in Budapest in 1996 and her husband founded a prize for literature in her name.