Berggren made her debut with the Swedish national team at the 1950 World Artistic Gymnastics Championships in Basel, Switzerland.

She had to apply for dispensation to participate in the world championships, as she had only recently turned sixteen at the time of competition and was considered underage for the Swedish squad.

[2] At the 1952 Summer Olympics in Helsinki, Berggren won a gold medal in the team exercise with portable apparatus.

[3][4] Berggren's best result in an individual event was earned at the 1954 World Artistic Gymnastics Championships in Rome, where she won bronze on vault.

She finished 0.030 points behind her compatriot Ann-Sofi Pettersson and the Soviet Union's Tamara Manina, who tied for gold.