She was appreciated as a star of the troupe for her tenure in Sweden, but became perhaps most known in history because of her love affair with the king's brother, Duke Charles, a relationship that attracted attention, particularly because of the amounts he spent upon her, and for the great sorrow he showed upon her early death.
Count Axel von Fersen the Elder noted in December 1782 that Charles had replaced Charlotte Slottsberg with Baron (after the exile of Charlotte Eckerman), and gave a detailed account upon Baron's death in March 1783: "The troubles of the King and the court was further increased by the hasty death of the premier actress of the French troupe mademoiselle Baron.
The conduct of the duke toward the ladies Eckerman and Slottsberg, whom he had at several points left and retaken and to whom he had refused to pay the annuities he had granted them, even though he had legally signed and issued them, made m:elle Baron careful and late to make a decision.
Eventually, however, this matter was solved with a sum of 60,000 daler in advance as well as an insurance to keep her with an upkeep of residence, furniture etc; with this sacrifice the duke lived several months with her, and found more pleasure in this trade of love each day until death extinguished this flame of love.
The king and the duke financed the funeral of this actress; she was put to rest in the centenary of Jacob, and the procession was followed by people of the royal court, hardly appropriate for a person of her class, as her profession is excommunicated by the Catholic church.