Foreword:
After searching around, I feel like there are quite few fanfics.
Just come and write
The heroine is not a little C, she is an orphan
So I'm not a very loving person : P
The background is 49 years back from 1919 to 1870, which happened to be the period of the Paris Commune after the Franco-Prussian War.
It's not a textual research party, so don't take it seriously.
Just sauce