The longtime Rodgers Forge resident was 89.
After graduating from the Institute of Notre Dame in 1940, she was a war worker during World War II.
She was married in 1952 to Hugh H. Trader Jr., who was a noted Baltimore News-Post sports reporter. He died in 1967.
She earned both her bachelor's and master's degrees from the Johns Hopkins University, said her son, Hugh H. Trader III of Anneslie.
Mrs. Trader went to work for the Johns Hopkins University in 1960 as a secretary, and later became the head of pediatric billing for the rheumatoid arthritis clinic at Johns Hopkins Hospital. She retired in 2001.
Mrs. Trader, who had lived for years on Overbrook Road in Rodgers Forge and moved to the Mercy Ridge retirement community in Timonium two years ago, was a world traveler.
She also liked investing and studying her investments. She was a lifelong Democrat and "enjoyed political debates with me," said her son.
Mrs. Trader had been an active communicant of St. Pius X Roman Catholic Church, 6428 York Road, Rodgers Forge, where a Mass of Christian burial will be offered at 10 a.m. Friday.
In addition to her son, she is survived by two sisters, Gemme Stracke and Mary Harper, both of Lansdowne; three grandchildren; and two great-grandchildren.