Halkina and teammate Melitina Staniouta represented Belarus at the 2015 European Championships, where she won 3 medals: team silver and 2 individual bronzes for hoop and clubs. Halkina then competed at the 2015 Holon Grand Prix where she finished 16th in all-around after a drop and roll out of carpet from her hoop apparatus. She qualified to 3 event finals: placing 4th in clubs, ball and ribbon. On May 22–24, Halkina competed at the 2015 Tashkent World Cup finishing 5th in the all-around with a total of 70.400 points. She qualified to 3 apparatus finals: she won silver in clubs and 2 bronze in ribbon, ball. Halkina finished 11th in all-around at the 2015 Grand Prix Berlin, she qualified to 2 event finals: won bronze in ribbon (tied with Margarita Mamun) and 4th in ball. On June 15–21, Halkina competed at the inaugural 2015 European Games where she finished 6th in the all-around behind Georgia's Salome Pazhava. Halkina then finished 8th in all-around at the 2015 Summer Universiade, she qualified to 3 apparatus finals placing 4th in clubs, and 8th in ribbon, hoop. In August, Halkina competed at the 2015 Budapest World Cup finishing 6th in all-around behind Ukrainian Ganna Rizatdinova, she qualified to all 4 apparatus finals taking bronze in ribbon, 5th in hoop, and 8th in clubs and ball. In her next competition at the 2015 Sofia World Cup, Halkina finished 9th in the all-around behind Marina Durunda of Azerbaijan. She qualified to 2 apparatus finals finishing 6th in ball and 8th in ribbon. At the 2015 World Cup series in Kazan, Halkina finished 12th in the all-around after a disastrous ball routine, she qualified to 3 apparatus finals finishing 6th in hoop, 5th in clubs, 4th in ribbon.