The Woman Who Survived A Shipwreck, Starvation, And Isolation — The Incredible Story Of Marguerite De La Rocque
This was a violation of the social code of her time.
It was not unusual for unmarried people to enter into romantic relationships without family approval; what was unusual was the specific context of a colonial expedition, under the direct authority of a man who had both family and official reasons to enforce compliance.
What Roberval did — abandoning her on an uninhabited island — was potentially fatal.
It killed three people: her companion, her child, and her nurse.
It subjected her to years of suffering and deprivation.