At the 2015 European Championships, Mileva finished fiftieth in the all-around during the qualifications. She then went to the 2015 Varna Challenge Cup where she finished eighth in the balance beam final. She then represented Bulgaria at the 2015 European Games alongside Albena Zlatkova and Valentina Rashkova, and they finished twenty-fifth in the team competition. She won the bronze medal in the all-around at the 2015 Bosphorus Tournament in Istanbul.