Born in Denton, Texas on February 21, 1915, Sheridan was the daughter of G. W. Sheridan and Lula Stewart Warren Sheridan. She said that her father was a great-great-nephew of Civil War Union general Philip Sheridan. She had a sister, Pauline. She was active in dramatics at Denison High School and at North Texas State Teachers College. She also sang with the college's stage band.