She was born in Château d'Oex, Vaud, Switzerland, where her parents, the former Rosalind Potter (Beatrice Webb's sister) and George Dobbs, were then living.
Kitty's aunt, Beatrice Webb, who, with her husband, Sidney Webb, 1st Baron Passfield, had recently defended the Soviet Union in their book Soviet Communism: A New Civilization?, called Muggeridge's Manchester Guardian articles "an hysterical tirade" but was more restrained in her private communications with the couple.
[6] With Ruth Adam, she wrote Beatrice Webb: A Life 1858–1943 (1967), which although more a memoir than a scholarly book, was positively reviewed at the time.
[8] Like her husband, she became an admirer of the Calcutta-based nun Mother Teresa, about whom she wrote a book, Bright Legacy (1983), a work published the year after the couple had become Catholics.
Following the death of her husband in 1990,[2] Muggeridge lived with her son John and daughter-in-law in Welland, Ontario, Canada, where she died in June 1994.