Her contribution to his work was not only her participation in the cast, but also in the script and the special effects (in particular, Pathécolor process to which she introduced her husband).

Most of them were shot by Segundo de Chomón, but she also appeared in films of Gaston Velle, Albert Capellani, Ferdinand Zecca and Lucien Nonguet.

Many of these productions are marked by the use of special effects, of which her husband and she have become specialists, such as stop-motion animation, pixilation, overprinting, dissolving, even tracking shot.

[3] She died in oblivion at the Hospice of Charity (Ospizio della Carità) in Chieri (Italy) on December 1, 1943, while the city was still under German occupation after the fall of Fascist Italy.Principal character of movies where magic was central, Julienne Mathieu was almost always presented as the master of ceremonies, unlike other productions of her time, by Méliès or Blackton for example, which faced the same diegesis.

[4] In En avant la musique (1907), a film parodying Méliès' Le mélomane (1903), for example, she was playing a female bandmaster who stole the heads of her male musicians to throw them on a giant musical sheet.