Haidu's senior debut at a major international event was at the 2010 European Championships. Here she contributed to the team bronze medal by competing on all four events. Individually, she won bronze on balance beam. In October she was selected in the national team to compete at the 2010 World Championships. Here she helped her team qualify in the fourth position by competing on all four events (balance beam, vault, beam and uneven bars). Individually, she qualified in the all around event (12th place). She ended her first world championships experience by placing fourth with the team and ninth all around.