Answer
The answer is Lisa Vittozzi. Wierer and Vittozzi are both members of the Italian national biathlon team and have competed together in numerous events, including the Mixed relay. However, Vittozzi was not part of the Italian team that competed in the Mixed relay at the 2018 Winter Olympics, which consisted of Wierer, Dorothea Wierer, Lukas Hofer, and Dominik Windisch.