Milles got many commissions from cultural institutions in Stockholm, among them the Royal Dramatic Theatre for medallions and busts of the singer Jenny Lind and the actor Georg Dahlqvist. In 1904–16, she participated in a number of international exhibitions like in St. Louis (1905) and Buenos Aires (1910), where she received silver medals for her work, Rome (1911), the world's fair in San Francisco (1915) and the Swedish art exhibition in Charlottenborg Spring Exhibition, Denmark (1916). However, her failing health forced her to abandon her sculpturing and she turned first to painting and later to writing instead. She also made illustrations for books, her own and those of other writers.