[3]: 133  Stauffer won a swimming competition in 1931 by crossing the Peñalara lagoon in under two minutes,[1] and in 1938 she was the first woman to attempt the Flying Kilometer skiing race of St. Moritz.

[3]: 134 After the end of World War II in Europe, Stauffer became a major figure in Spanish–German relief efforts, which she helped form alongside José Boos.

[3]: 137 Much of her work involved securing the release of Nazis who were imprisoned in Spain, such as those at the Sobron internment camp, by taking charge of them in the capacity of a charitable organization.

[1] Her supply was considerable; her nephew described each room as "filled with dozens of pairs of boots, shirts, jackets, trousers, socks and gloves".

[3]: 136  She is estimated to have aided 800 Nazis in their escape to Spain,[7] including figures such as Léon Degrelle, Otto Skorzeny, and Adolf Eichmann.

[1][2] Stauffer's activities became publicly known on 23 January 1945, after British journalist Sefton Delmer published an interview with her in the Daily Express.

[2] Two years later, her name was included on the Allied Control Council repatriation list of 104 individuals in Spain wanted for their involvement in Nazi crimes.

[1] She was a main character in the historical fiction novel Los pacientes del doctor García by Almudena Grandes,[1][7] and she was portrayed by Eva Llorach in its television adaptation of the same name.