Making her senior international debut, Dastich finished 14th at the Nebelhorn Trophy, an ISU Challenger Series event in September 2015. She finished fourth at the German Championships. In February 2016, she won her first senior international medal – bronze at the Bavarian Open. In March, she represented Germany at the 2016 World Junior Championships in Debrecen, Hungary. She placed 18th in the short program, 10th in the free skate, and 12th overall. During the season, she was coached by Anett Pötzsch in Dresden.