Ilona Szöllősi, as an athlete of TFSC, achieved success both in athletics and gymnastics. In 1928 she participated in the Amsterdam Olympics as a member of the Hungarian gymnastics team. The Hungarian women’s team led after the first day but fell back to fourth on the second as a result of the judges’ decisions. In November 1932, the board of directors of the Association of Hungarian Gymnastics Associations (MOTESZ) donated a large bronze medal to the members of the gymnastics team, with five ringed enamels and the engraved inscription “In memory and compensation - 1928”. In athletics she won the Hungarian title in shot put in 1933, and in 1935 in shot put and discus throw in the colors of the NTE. In 1934, she broke the national record in shot put. In addition to her sports career, Szöllősy worked as a PE teacher.
Hungary