Bergere rose to play leading roles, but found her true success in vaudeville where for some seventeen years she remained one of the top draws in variety theatre.

Bergere first appeared on stage with her sister Leona as a chorus singer with the Conried Opera Company and later as an actress in German-language theatre productions.

[2] In 1892 she made her English-language debut with a stock company in San Francisco, California, as Dora Vane in Harbor Lights, a melodrama by George Robert Sims and Henry Alfred Pettitt.

She was Blanch Livingston opposite Steve Brodie at the Fourteenth Street Theatre in the Robert Neilson Stephens 1894 play On the Bowery.

[2] Over the season of 1897–98 Bergere was a member of the stock company affiliated with the Girard Avenue Theatre in Philadelphia, where she played Henrietta in The Two Orphans, adapted for the American stage by N. Hart Jackson and Albert Marshman Palmer from the original 1874 French play Les Deux Orphalines by Adolphe d'Ennery and Eugène Cormon;[4] Mrs. Rawlston, in James L. Ford’s Jim the Penman; Suzanne, in The Masked Ball; adapted by Clyde Fitch from the original French by Alexandre Bisson and Fabrice Carré; Miriam, in The Butterflies; and the title role in an adaptation of Carmen.

[2] At New York's Grand Opera House on November 26, 1900, Bergere played Cora, the hosiery model, in David Belasco's comedy Naughty Anthony, and the tragic Cho-Cho-San in the show's featured attraction, Madame Butterfly.

[10] Bergere first toured in Billie's First Love (1902) and then subsequent in productions such as Jimmie's Experiment (1903); His Japanese Wife (1904); The Chorus Girl in The Land of Nod (1905); A Bowery Camille (1906); The Morning After the Play (1907); A Prairie Flower (1908); The Lion Tamer (1908); The Sultan's Favorite (1909); Two Women (1911); She Wanted Affection (1911);[2] Judgment(1912);[11] Boston Baked Beans (1913);[12] Room 44 (1914);[13] Locks at Panama (1915);[14] and Little Cherry Blossom (1916).

In July 1908 the press reported that Berger had married Napoleon Edward Daignault, an aspiring opera singer known on the vaudeville stage as N. Dano.