On March 16–18, Mulmina won team silver medal at the 2012 Kyiv Junior World Cup with Eleonora Romanova. Then Mulmina and Eleonora Romanova competed at the 2012 European Junior Championships were Team Ukraine finished 4th, she qualified to 2 event finals taking a bronze medal in ball and finished 6th in clubs. On June 14–17, Mulmina burst onto the junior international scene at the 2012 Junior Irina Deleanu Trophy where she won gold in the all-around and event finals in hoop, ball, clubs and ribbon. On September 28–30, Mulmina together with teammates Ganna Rizatdinova and Viktoria Mazur represented Team Deriugins School at the Aeon Cup in Tokyo, Japan, Mulmina finished 4th in junior individual all-around finals behind Azeri gymnast Marina Durunda with team Ukraine taking 4th in the overall standings.