[2] After decent results at the 2009 European Athletics Junior Championships, the 2011 European Athletics U23 Championships, and an 8th place at the prestigious Hypo-Meeting in Gotzis (Austria) in 2012, Broersen was selected to compete at the 2012 Summer Olympics in London in the women's heptathlon event, where she finished 13th with a personal best score of 6319 points.

[3] At the 2013 European Athletics Indoor Championships in Gothenburg (Sweden) she was on course for a medal in the pentathlon, but was disqualified for a lane violation in the final event, the 800m.

[7] Later that year she won silver at the 2014 European Athletics Championships in Zurich (Switzerland) in the heptathlon behind France's Antoinette Nana Djimou,[8] breaking the outdoor national record in the high jump with 1.94m.

[14] At the 2016 European Athletics Championships in Amsterdam in her home country, Broersen, who moved from ninth on the first day to fourth after winning the long jump and coming third in the javelin, but was unable to run the final 800 metres event due to an illness.

[18] The 2017 season started with a 5th place at the 2017 European Athletics Indoor Championships pentathlon, but she had to abandon at the Hypo-Meeting in Gotzis, sparing her ankle.

[20] In Talence that year she failed to record a legal leap in the long jump and subsequently dropped out; the third incomplete heptathlon of the season.