[1] Myfanwy met fellow writer Donald Horne at a party[5] thrown by Michael Baume in Kings Cross, Horne proposed a week later over dinner at the Chelsea, a restaurant in Kings Cross.
[4][10] A politically active citizen, Myfanwy organised Struggle for Democracy in Australia 1788-1977 a historical exhibition at the Sydney Town Hall in 1977.
[11] The exhibition focused on the human rights struggles of Aboriginal people and women and the freedom of the press and religion in Australia supporting the republican movement.
[12][13] Myfanwy took on the role of editor for Donald Horne, working on all of his books, including The Lucky Country.
[4] She co-authored and edited his final book Dying: A Memoir, completing it after his death.