In 2017 she won the IBU Female Rookie of the Year Award for her World Cup debut season, with the male counterpart being awarded to her fellow Swede Sebastian Samuelsson. At the Pyeongchang 2018 Winter Olympics she won a surprising gold in the Individual, after four clean shootings. It was both the first victory and podium of her career, with her previous best being a fifth place in the world cup. She also claimed silver in the Relay, finished seventh in sprint, and fifth in both the mass start and the pursuit. Öberg repeated her Olympic success at the 2019 Biathlon World Championships on home snow in Östersund, where she again won the individual with a perfect shoot, having previously finished fourth in the sprint and fifth in the pursuit. She became the first female biathlete to win the individual World Championship title the year after taking the Olympic individual gold.