At the 2013 Biathlon Junior World Championships in Obertilliach, Austria, Dahlmeier took three gold medals in the individual, sprint and relay, as well as a silver in the pursuit.
Following this, she was selected for the German team in the women's relay at the 2013 Biathlon World Championships: racing in the third leg, she shot clean and overcame a 38-second deficit to hand over with Germany in the lead.
[5] The following season Dahlmeier's focus was on the 2018 Winter Olympics in Pyeongchang: at the Games she became the second German woman to take the Olympic gold in the sprint, shooting clean as one of only three competitors to hit all targets in windy conditions, before doubling up with a second title in the pursuit and additionally taking a bronze in the individual.
After the end of the season, in May 2019 she announced her retirement from competition, stating that she no longer feels the 100% passion necessary for professional biathlon.
For the 2019-2020 Biathlon World Cup season, she served as an expert commentator for the German broadcaster ZDF.
[8] In September 2019 she won and set a new women's course record in the 52-kilometer Karwendelmarsch race from Scharnitz to Pertisau in Austria.