While Petra Vermehren was hired in April 1934 as the first woman in the foreign policy editorship of the Berliner Tageblatt, the editor of Der Querschnitt, Hermann von Wedderkop, recommended Isa Vermehren to the political-literary cabaret of Werner Finck, Die Katakombe in Berlin, to perform.
With her taunts against the Nazi regime, Isa Vermehren was considered a young talent in the Berlin cabaret.
[6] After Erich Vermehren defected to the British recruited by Nicholas Elliott in 1944, Isa was arrested with her parents and her other brother Michael.
The superiors of the Society recognized Isa Vermehren's ability to convey demanding content in a lively manner.
Again Sister Isa became known to a wide audience when she spoke from 1983 to 1995 on ARD Das Wort zum Sonntag.