The actress and Hollywood costume supervisor, nicknamed Baby Marie Osborne, became the youngest leading lady in Tinseltown when she starred in films like Little Mary Sunshine.
Yeats died at her home in San Clemente, California on 11 November (10).
She played a boy in her first film when director Henry King needed a kid for his 1915 movie The Maid of The Wind. He discovered her at the age of three.
Impressed with his find, King went on to shape her career, writing Little Mary Sunshine just for her.
Her success launched a range of Baby Marie dolls, but her career was short-lived - her final starring role came in 1919 in the comedy Miss Gingersnap.
She returned to Hollywood in the 1930s and 1940s and occasionally worked as a stand-in actress for Ginger Rogers, Deanna Durbin and Betty Hutton.
But she found her true calling in the 1950s when she took a job as a costumer and worked on films like Spartacus, The Way We Were and Mame.
She also supervised Elizabeth Taylor's wardrobe in Cleopatra.