As soon as the war ended, Granville was released from her intelligence duties and was forced to find any work hshe could. She worked for a time as swtchboard operator at the India Hotel in London, then as a saleswoman at Harrod's department store and later an attendant at the Paddington hotel.

In 1951 she took a job as a stewardess on the ocean liner, Winchester Castle which sailed between England, Australia and South Africa. Her superior on the liner was a steward named Dennis Muldowney. Muldowney who suffered from schizophrenia became obsessed with Granville and declared his love for her. After she rebuffed his advance several times, Granville quit her job and moved to London. Muldowney followed her there, quitting his job and taking a position with the Reform Club in Winchester. Again professing his love for her, Muldowney was told by Granville in no uncertain terms that she wanted him to leave her alone. After this final rejection, Muldowney, began stalking her. On June 15, 1952, Muldowney spotted her walking down there stairs in her hotel and rushing to her, stabbed her to death. Muldowney was sentenced to death for the murder and was hanged in September 1952 at Pentonville Prison.

Granville was buried with the French Croix de Guerre, a medal from Poland, the George Medal for Special Services, the Order of the British Empire and the badge of the French Resistence.