At just 16 years old, she rides for CUBE Factory Racing and has quickly established herself as a formidable competitor. In 2025, Zierl secured her first Junior Women's World Cup victory in Leogang, Austria, and followed it up with a second-place finish in La Thuile, Italy. She also claimed the Austrian National Downhill Championship title. With her rapid progression and dedication, Zierl is widely regarded as one of the most promising young talents in the downhill racing scene.