In 1895, Helena converted to Roman Catholicism in St. Eugenia's Church (Stockholm). The conversion received great attention in the media and she endured much criticism in her circle of friends to have fallen for Rome. Her husband, himself not a Catholic, publicly defended her conversion. The Catholic minority in Stockholm was proud of the famous convert. (Because Nyblom converted in adulthood her children were educated in Church of Sweden, but a son converted later in life and gave rise to a large Catholic family.)