She painted a wide range of prominent individuals, including crowned heads of Europe, American politicians, scientists and industrialists.

Wenner was born in the first quarter (January, February or March) of 1884[2] in Manchester, England, to Swiss parents, although in later life she made a wide array of claims about the specific year of her birth within the 1880s.

[5] Wenner, who studied with Sir Walter Crane in England, and Heinrich von Angeli in Vienna, in Munich and in Paris,[8] was also said to be a talented harpist.

[3] A suitcase stolen from the vestibule of her apartment in 1940 contained US$3,500 (equivalent to about $76,120 in 2023) of jewelry, including a platinum bracelet set with diamonds and sapphire, and a string of pearls.

], Bishop Charles Palmerston Anderson, Amy Leslie,[11] the Duchess of Teck and her children,[5] Count Ferdinand Zeppelin, the queen of Württemberg, King William II of Württemberg, Governor Len Small of Illinois, Professor Steinmetz, Otto H. Kahn, Harold F. McCormick,[16] William Hohenzollern, Emperor Franz Joseph, Franklin Roosevelt, Eleanor Roosevelt, Herbert Hoover, Clara Clemens, Maria Jeritza, and Charles Curtis.