However, her friend Samuel Gagnebin gifted her excerpts of Prière pour demander à Dieu le bon usage des maladies by from Blaise Pascal, and she was transformed.

[2] Monastier did her studies in Payerne and Lausanne, and stays in Great Britain and Germany; where she trained as a teacher and she also discovered the living conditions of workers, unemployment, class struggle and socialism.

This was the forerunner of the "Camp d’éducatrices de Vaumarcus", a center for meetings, training and vacations for Christian Unions of young people, in which she participated every year up until 1962.

In 1911, she joined the Christian Socialist movement and helped working class youth at the Maison du Peuple (‘People’s House’) in Lausanne.

In Les Ormonts in the alpine area of canton Vaud, from 7 to 28 August 1924, she participated with a dozen committed male and female pacifists in the first voluntary work camp organized by Pierre Cérésole in Switzerland, offering help, supplies, accommodation and tools in the village, where a winter avalanche covered a house and its grounds with rocks, mud and tree-trunks.

"With the brain of a CEO, she had all the assets: great clarity of thought, rapidity of decision, innate sense of organization, good pen and a lot of humor".

Interested in the activities of the Maison du Peuple, she became involved as a facilitator and participated in the meetings of the Lausanne group of Christian Socialists.