In late 2005 she felt the urge to return athletics, juggling her training and caring for her son. A loss to Nataliya Tobias at the 2006 national championships inspired her to restart her professional career and she began training with Iryna Lishchynska. She was happy with her improving times but suffered a narrow exit in the semi-finals at the 2007 European Athletics Indoor Championships. The outdoor season in 2007 proved to be a turning point however; she took the silver medal at the 2007 European Cup and set new 400 metres and 800 metres personal bests. She ran the 800 m under two minutes for the first time at the national championships, winning in 1.59.60 seconds. Further improvements came shortly afterwards at the 2007 Summer Universiade where she won the gold medal, setting a world-leading time of 1.57.63 seconds. The pressure to compete at the 2007 World Championships as world-leader proved too much for Krevsun, and she was knocked out in the heats with a below-par 2.02.45 minutes. However, at the end of the season she was still the fifth fastest 800 m athlete that year.