His father was the anthropologist and propertied aristocrat George Henry Lane Fox Pitt-Rivers and his mother, Emily Rachel Forster, was an actress and daughter of the governor-general of Australia, the 1st Baron Forster.
Having completed her training, Best nursed at Wyong Hospital on the New South Wales central coast, was appointed Acting Matron at the Rachel Forster Hospital in Sydney and later Deputy-Matron at the Masonic Hospital in Ashfield.
At the formal investiture of the award, on 28 July 1921, in the ballroom of the New South Wales' State Government House, Lord Forster, the seventh Governor-General of Australia, was so nervous that he dropped the decoration before it could be pinned on de Mole's chest.
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