She began her career in the early 1910s, when she became a disciple of Juan Francisco González -considered one of the four "great masters of Chilean painting"- whom she met through her friend, the also painter, Marta Villanueva.
[1] She traveled to Europe with her family between 1920 and 1921, a period in which she had classes in Paris, France, with the sculptor Antoine Bourdelle,[2] who would portray her in a bust entitled Le Chilienne and whose works are in the artist's museum.
[3] In 1923, back in Chile, Petit joined the Montparnasse group, an avant-garde movement of influences from Post-Impressionism and Fauvism.
The group included José Perotti and the brothers Julio and Manuel Ortiz de Zárate,[1] as well as Luis Vargas Rosas.
[4] In 1926, Petit settled in Paris, where she continued to specialize in sketches, drawing and painting, and joined the artistic environment which she shared with, among others, the French Le Corbusier and Fernand Léger, the Spanish Juan Gris, Joan Miró and Pablo Picasso, the British William Hayter and the American Alexander Calder.