In 1959, the International Federation of University Women (IFUW) appointed Lucke as the organization's representative to the United Nations. In 1964, she served as a delegate of the IFUW to the Pan-Pacific and Southeast Asia Women's Association (PPSEAWA) Tonga Conference, and attended seminars in Brisbane and Melbourne. The following year, she was appointed by PPSEAWA as its delegate to the United Nations, attending the U.N. Conference on Women in Teheran, where she presented a draft on issues facing women. In 1969, she resigned from the American Council of Nationalities Service and attempted to retire in Florida. Lucke was honored by the United Nations in 1975, for her work which was "marked by a sensitivity to indigenous people and their culture and a deep understanding of social structures and issues". She was inducted into the Michigan Women's Hall of Fame in 1986 for her roles in developing international relations and social work. That same year, Unforgettable Memories, a book printed in India was published about her time in the country, as a diary of her experiences. Unsatisfied with the portrayal, her memoirs Remembering at eighty eight: Letters I should have written were published the following year.
