When she was just 17, Jentsch participated in her first World Women's Curling Championship at the 2015 World Women's Curling Championship. Her team of her sister Daniela Jentsch at skip, Stella Heiß at second and Pia-Lisa Schöll at lead beat top teams Sweden and United States before losing their last five games to finish with a record of 4–7. Jentsch played in her first European Curling Championships the following season at the 2015 European Curling Championships as third for the German team. The team missed the playoffs with a 4–5 record but did qualify their country for the 2016 World Championship. The team struggled during the week of the World Championships, finishing the round robin in tenth place with a 3–8 record.