Mlle. Descaluzas was popular, in the way that Music Hall stars were in the UK at this time. Her famous roles are still called 'the Desclauzas roles' - I found a lovely write-up of a woman who still specialises in these roles today (very pretty!).*
There was no TV and people 'made their own entertainment' back in those days! Therefore, I assume we're looking at the evidence of an early 'lookalike/soundalike' event, where the Municipal Theatre of Valence put on an event, maybe a comptition, at least twice. Women who could sing (and perhaps look) like Mlle. Desclauzas, came along in their best dresses, performed, got their photos taken, and maybe won a prize. Who knows? But that seems reasonable, although Google can't give me any evidence of it.
Alternative 'denouements' welcome! (I never knew until I got to France that this word literally means 'unknotting', but that's a good word for the resolution of a mystery, isn't it?)