 Complete the following phrase:  Terzić made her first impact in senior level athletics in the 2012 season. She won the silver medal at the 2012 World Junior Championships in Athletics with a Serbian national record time of 4:07.59 minutes for the 15000 m. A week later she took both the 1500 m and 3000 m titles at the Balkan Athletics Championships. She placed fourth in the 1500 at the Rieti Meeting and ran another national record in the non-standard 1000 m distance at the Athletics Bridge meet. In her final appearance in the junior category, she won the gold medal at the 