Daniela Biechl competed in her first international race in the 2002 biathlon as part of the European Junior Cup . The greatest international success was her participation in the 2003 Junior World Championships in Kościelisko , where she was 48th in the individual, 38th in the sprint, 49th in the pursuit and 14th with Selina Spitz and Sarah Stanonik. Biechl achieved her greatest successes nationally. At the Austrian Championships in 2002 she won the bronze medal in the relay race with Martina Leitinger and Christina Höck, and in 2003 the title alongside Selina Spitz and Sandra Flunger .
In cross-country skiing, Biechl competed in her first international FIS races in December 2002 , and in 2004 she competed in the cross-country skiing Continental Cup . She was able to achieve good, albeit never outstanding, placements several times. After 2005 she did not contest any international races.