Whenever I try to research her, I always come back to the same couple of articles that talk about the exact same stories about bar fights and burning convents. I’m not sure if she wrote all this down, or if someone else wrote it down, or if it was just some random lover’s hearsay 50 years later. I need answers, god damnit!
A life of Julie D'Aubigny written 60 years after her death ends as follows:
La passion que Mlle Maupin avoit pour les exercises des armes, & Phabitude fréquente où elle étoit de s'habiller en homme, ont donné lieu à,plusieurs histoires vraies ou fausses qu'on raconte d'elle, mais comme elles sont la plûpart dans un goût romanesque, & peu nécessaires à notre sujet, nous ne jugeons pas à propros de les rapporter. Mémoire Manuscrit, ...
The passion which Madamoiselle Maupuin had for the exercise of arms, and her frequent habit of dressing herself like a man, has given ground for many stories true or false which are told about her, but because they are mostly in a novel-like spirit, and little necessary for our subject, we have not judged it proper to report them. Manuscript memoire.
François and Claude Parfaict, Dictionnaire des Theatres de Paris (Paris: Rozet Libraire, 1767) tome 3 pages 350-352 https://archive.org/details/dictionnairedes01pargoog/page/n344