She was born in Detroit on Sept. 19, 1923, to Marcelline Hemingway Sanford and Sterling Skillman Sanford. After graduating from Grosse Pointe High School, she attended Mac Murray College and later graduated from Michigan State University.
In Grosse Pointe, Mrs. Coolidge was active in Grosse Pointe Memorial Church and served as a deacon in 1974-77. Other activities included the League of Women Voters, American Association of University Women, theater arts and assisting teachers at Grosse Pointe South High School grading and correcting students' papers. When she moved to Chapel Hill, she was active in Presbyterian Church and in tutoring urban youth in reading. Her retirement years included several cruises and trips abroad. After her husband's death in 1995, she moved to Goodwin House, a retirement facility in Falls Church, Va., to be near to her son, David Jr. In 2002, her son tragically died at age 46 from brain cancer.
Mrs. Coolidge is survived by her devoted daughter-in-law, Joan Orgon Coolidge, of Falls Church, Va.; and three grandchildren, Daniel Coolidge, Samuel Coolidge and Rosalind Coolidge. Her siblings, James Sterling Sanford (wife, Marian) of Petoskey, and John Edmonds Sanford (wife, Judith), of Tiburon, Calif., survive her as do numerous nieces and nephews.
A memorial service took place on April 22 at her residence at Goodwin House, and later this year her ashes will be spread near her beloved summer cottage on Walloon Lake.