She later completed her training with the embroidery artist Blanche Ory-Robin, who introduced her to needle painting.
[2] Desvallières began creating works of art when still young, regularly exhibiting at the Salon d'Automne, where she presented a fireplace screen in 1912 and velvet curtains in 1913.
[5] She then focused on embroidery, especially in connection with religious vestments and altar coverings, presenting her works at the "Art religieux" section of the Société Nationale des Beaux-Arts and, from 1922, at the Salon d'Automne.
[5] On 20 September, she entered the convent as a postulant, taking the name of Sister Marie de la Grâce on 7 May 1927.
[6] She later founded a workshop for making chasubles at the Ateliers d'Art Sacré created by her father in 1919 gether with Maurice Denis, a French painter and decorative artist.