So, I posted my list, but I am going to have to reference the book I was reading again. It had a list of her existing films, but when I looked up one of them, it had been attributed to Louis Feuillade. Since she was Feuillade's mentor, perhaps she was a producer on this particular film. I'll have to do a lot more research. But Guy-Blache had a full & interesting career (even if she never made another film after 1920).