Thank you all very much for your responses. I will explore the avenues you have indicated to me and will be sure to keep you informed of my research.
These are the only documents I have: she had six children with the same man, but they never married, so I don't have a marriage certificate that could ...

Hello, my genealogical research on my paternal grandmother who arrived in France and who died in France in 1996, she always kept Polish nationality except that I cannot find the city of birth noted on all the documents concerning her, whether it is her death certificate or her residence permit ...