[3][4] At the 2014 Summer Youth Olympics held in Nanjing, China, Bullen represented Norway and she won the gold medal in the girls' 60 kg event.

[5][6] In 2015, she represented Norway at the European Games held in Baku, Azerbaijan and she won one of the bronze medals in the women's 58 kg event.

[7] Bullen also competed in the women's 58 kg event at the 2015 World Wrestling Championships held in Las Vegas, United States where she was eliminated in her second match by Marianna Sastin of Hungary.

[10] In the same year, Bullen was eliminated in her first match in the women's 58 kg event at the 2017 World Wrestling Championships held in Paris, France.

[13] A month later, at the 2018 World U23 Wrestling Championship held in Bucharest, Romania, she won the gold medal in the women's 59 kg event.

[14] In 2019, Bullen won one of the bronze medals in the women's 57 kg event at the Golden Grand Prix Ivan Yarygin held in Krasnoyarsk, Russia.

In the same year, she also competed in the 57 kg event at the 2019 European Games held in Minsk, Belarus where she lost her bronze medal match against Anastasia Nichita of Moldova.

[16] In March 2021, Bullen competed at the European Qualification Tournament in Budapest, Hungary hoping to qualify for the 2020 Summer Olympics in Tokyo, Japan.