At the 2012 European Championships in Helsinki, she was eliminated in the preliminary round of the 100 metres hurdles with a time of 13.38. During the 2012/13 indoor season, she managed to improve her personal record at the 2013 European Indoor Championships to 8.18 in the 60 metres hurdles and took the semifinals. In the outdoor season, she opened the season promising with a time of 13.06 in a strong tailwind. During the Bislett Games, she improved her personal best time of 13.16 seconds in the approved wind. During friidrettsgalaen in Mannheim, Germany, she further improved her personal record to 13.04. Thus, she qualified at the 2013 World Championships in Moscow (B standard). At the World Championships, she finished 30th overall with a time of 13.43 and did not advance past the heats. In July 2013, Pedersen competed at the 2013 European U23 Championships and won gold in the final with a time of 13.12, ahead of Pole Karolina Kołeczek (13.30).