In 2019 Zimmermann turned senior. She made her debut at the DTB Team Challenge where she placed eighth in the all-around and helped Germany finish fifth as a team. The following month she competed at the European Championships where she placed twenty-fourth in the all-around. In June Zimmermann competed at the Flanders International Team Challenge in Ghent, Belgium alongside Kim Ruoff, Lisa Schöniger, and Isabelle Stingl. Together they placed seventh in the team final. Individually Zimmermann placed twentieth in the all-around.