She married in 1939 but lost her husband the following year, when the ship on which they were travelling to Canada was sunk by a German submarine.
Later that year she joined her family in Princeton, New Jersey, and was granted US citizenship in 1952.
Between 1954 and 1986, she lived with her partner Antonio Spadaro in Villa Monacone on Capri.
This was her most productive time as a writer and her books and several magazine articles were written during this period.
After the death of her partner she left Capri and spent her last years until her death with her brother Golo's adopted family in Leverkusen, Germany.