Bengtsson has won gold medals at the 2009 World Youth Championships and the 2010 World Junior Championships in Athletics. She set a mark of 4.47 m for the youth world record for the event in 2010 and broke the world junior record with a vault of 4.63 m in 2011. Bengtsson placed tied 4th at the 2015 World Championships in Beijing, China, having set a national record of 4.70 m in the final. She set a then-national record with 4.81 m, set indoor in Clermont-Ferrand, on February 24, 2019. Bengtsson has won eleven national titles.