She was one of seven children of the noble Carl Adolph Möllersvärd and Maria Charlotta L'Estrade, and sister of Carl Magnus Möllersvärd. She is foremost known for the occasion, where she danced with Tsar Alexander I of Russia at the Diet of Porvoo in 1809, which was repeated at Mäntsälä some days later and gave rise to rumors that they had an affair: the incident has been portrayed in fiction. She was the subject of much attention in contemporary Finland. She was claimed to be the foster child of Möllersvärd and in actuality the secret illegitimate daughter of Princess Sophia Albertina of Sweden; Möllersvärd was also reputed to have had a secret child with Tsar Alexander.