[1] Known to her friends as "Dolly", she married her cousin James Armand de Rothschild (known as Jimmy) at the age of 17 in 1913.

Dorothy de Rothschild assisted her husband in his political campaigns, particularly from 1929 to 1945 when he was Liberal Member of Parliament for the Isle of Ely constituency.

[2] She remained a strong influence on the preservation and development of the house and collections at Waddesdon.

Dorothy de Rothschild continued the Zionist interests of her father-in-law and husband, and was a close friend of Chaim Weizmann.

At her death in 1988, she left £94,117,964 (equivalent to £318.8 million in 2023), the largest probated estate to that date in England and Wales.