Her greatest victory was in the 1956 Winter Olympicsgiant slalom at Cortina d'Ampezzo, Germany's sole gold medal at these games. After having seriously injured an ankle in 1954, she was not expected to do well at these games. She also drew the #1 start position for the one-run event. Putzi Frandl, who won the Silver medal in the event, once stated that, "Ossi was disappointed to draw #1 as that was usually not a good position. The first racer down the course usually has to scrape off a bit of snow, which slows you down. But Ossi had a great run and overcame that difficulty."