The larger-than-life character, who was known as an astrologer and wrestling promoter, "died in her sleep as she wished," said her youngest son, Frank.
"It was hard not to like her, she was a very eccentric and flamboyant person," he added in an Instagram post.
"Her mind was razor sharp until the day she died."
Born Jacqueline Frances Labofish on 29 November 1921, Stallone ran away from her home in Washington DC as a 15-year-old to join the circus.
