[1] Pettersson was also active in the Swedish National Association for Women's Suffrage (FKPR).
She specialised in legal advice to women in matters of family issues, particularly divorce and women's property rights, which was a complicated issue in the early 20th century, when a woman's rights differed greatly depending on her marital status.
Eschelsson occasionally assisted her with legal advice, and encouraged her to continue as long as she had clients.
However, while it was not illegal for a person without formal training to offer legal advice, her practice was all the same questioned by lawyers.
In 1915, she retired and left her bureau to Eva Andén, Sweden's first formally trained female lawyer.