Cornelia Pröll is the youngest sister of Annemarie Moser-Pröll and was therefore familiar with skiing from an early age. Due to her great talent, she joined the Salzburg national team at an early age and was later accepted into the ÖSV team. In the 1976/77 season Pröll got her first points in the European Cup , two years later she started in the World Cup for the first time .
She got her first World Cup points as an 18-year-old with seventh place in the downhill from Pfronten on February 4, 1979. In the same year she became Austrian downhill champion. The Salzburg native achieved her first podium on January 7, 1980 with second place in Pfronten. At the 1980 Winter Olympics , however, she only came in 22nd downhill rank. The 1980/81 season was Pröll's most successful: On January 8, 1981, she won her first and only World Cup race, again in the downhill from Pfronten, and achieved third place in the Downhill World Cup behind the two with another two third places in Megève and Haus im Ennstal Swiss Marie-Theres Nadig and Doris De Agostini . In the next winter, however, Pröll only made it into the top ten once, at the 1982 World Cup in Schladming she was 15th in the downhill. After this weaker season, she threatened to be relegated to the Austrian B-squad, whereupon she ended her career at the age of only 21.