Gössner made her debut at the Biathlon World Championships at the 2011 competition in Khanty-Mansiysk, Russia. Following top ten finishes in the sprint and pursuit races, she won her first world title in the women's relay, claiming the gold medal alongside Andrea Henkel, Tina Bachmann and Magdalena Neuner. One year later, Gössner successfully defended the women's relay gold medal with the same German team.