Because she was a Jew Jungmann went to Britain at the start of World War II, where she resumed her friendship with the Beerbohms at their temporary home in Abinger.

During the war Jungmann worked for the Jewish Central Information Office in London as a research assistant.

[2] Beerbohm wrote a letter to the Aliens Tribunal on her behalf urging her suitability for British citizenship.

[7][8] Jungmann acted as hostess to Beerbohm's many visitors, including Ezra Pound, who lived nearby, and Somerset Maugham, John Gielgud, Laurence Olivier and Truman Capote among others.

After her own death in 1958 her sister Eva Reichmann became the executor of Max Beerbohm's literary estate.