While working as a sweeper at the Théâtre Mogador, she met David Kaplan, a young émigré from Estonia, which was then under the control of Bolshevik forces and the seat of serious political unrest.
Since the artistic world was strongly attracted by Russian culture at the time, David took the name Dimitri Kirsanoff as his screen name and chose the name Nadia Sibirskaïa for Germaine.
Sibirskaïa plays an abandoned fiancée, indirect victim of a conflict between two hostile communities; her ability to express both fragility and suffering attracted the attention of critics and the public.
It was her meeting with Jean Renoir that offered Sibirskaïa the opportunity for her most memorable appearances on the French screens of the 1930s, with delicate roles well suited to her style and personality.
In The Crime of Monsieur Lange she plays Estelle, a sincere young woman overwhelmed by the misfortunes of life, pregnant by an unscrupulous seducer.
Finally, in La Marseillaise, she plays Louison, a young woman from the Faubourg Saint-Antoine to whom she gives a radiant face in the middle of the revolutionary turmoil.