Especially remarkable considering the >80% mortality rate for mothers until the 20th century.
"Unfortunately, surgical techniques of that day also contributed to the appallingly high maternal mortality rates. According to one estimate not a single woman survived cesarean section in Paris between 1787 and 1876."
The problem with c-sections was figuring out how to successfully sew up the uterus afterwards. In 1876 doctors started just removing the uterus after c-section.
The woman who gave herself a c-section was able to get medical care soon afterwards. Otherwise she certainly would have died from the wound.
"Unfortunately, surgical techniques of that day also contributed to the appallingly high maternal mortality rates. According to one estimate not a single woman survived cesarean section in Paris between 1787 and 1876."
https://www.nlm.nih.gov/exhibition/cesarean/part2.html