At the European Championship 2004 in Győr, together with other members of the junior team Arunović won a silver medal and in 2005 in Estonia she won the bronze. 2006 at the European Junior Championships in Moscow she won individual and team gold medal. Arunović also won bronze in the junior team in 10 m Air Pistol and individual gold in 25 m Pistol at the 2006 ISSF World Shooting Championships in Zagreb. At the 2009 Mediterranean Games in Pescara she won the gold medal.