In 2015, she began the season competing at the 2015 Moscow Grand Prix finishing 8th in the all-around. her next event at the 2015 Thiais Grand Prix she won the all-around silver ahead of Israel's Neta Rivkin, she qualified to all 4 event finals winning bronze (ball, clubs, ribbon) and placed 8th in hoop. Moustafaeva finished 10th in all-around at the 2015 Bucharest World Cup, she qualified to 3 event finals and won bronze in clubs. Moustafaeva competed at the 2015 European Championships and finished 8th in hoop and ribbon finals. Moustafaeva finished 14th in all-around at the 2015 Berlin Grand Prix. On 15–21 June Moustafaeva competed at the inaugural 2015 European Games where she finished 7th in the all-around. Moustafaeva then finished 9th in all-around at the 2015 Summer Universiade, she qualified to 3 event finals finishing 5th in ribbon and 6th in clubs, hoop. In August, Moustafaeva competed at the 2015 Budapest World Cup finishing 12th in all-around. At the 2015 World Cup Final in Kazan, Moustafaeva finished 9th in the all-around with a total of 68.800 points, she qualified to 3 apparatus finals finishing 4th in hoop, ball, clubs. On 9–13 September Moustafaeva competed at the 2015 World Championships in Stuttgart where she qualified to 1 apparatus final finishing 7th in ribbon (17.750). In the All-around finals, Moustafaeva finished in 12th place with a total of 69.715 points, behind Korean Son Yeon-Jae.