Terzić began 2010 with a win at the Belikros cross country race in Serbia. On the track she was eighth in the 1500 m at the 2010 World Junior Championships in Athletics and won the 3000 m at the European junior clubs championship. He first major junior medal came in the form of a silver medal at the 2010 European Cross Country Championships, finishing three seconds behind winner Charlotte Purdue. Another win at the Belikros opened 2011 In her world debut on grass she came 32nd at the junior race of the 2011 IAAF World Cross Country Championships, which was among the best placings by a European. A 1500/3000 m double at the 2011 European Athletics Junior Championships confirmed her place among the top junior runners in the region. She won a third European medal of the season at the 2011 European Cross Country Championships, taking the bronze medal.