Höfflin's father is Swiss, her mother from New Zealand. When she was twelve years old, her parents divorced. She moved to Great Britain with her mother and lived in Tewkesbury in Gloucestershire . During her school days, Höfflin mainly played hockey and skiing took a back seat. She then studied neuroscience at Cardiff University . Their only training opportunity in the UK was an indoor ski park in Manchester .
During a year in between, Höfflin trained intensively in the Savoy Alps . She earned her living in Tignes and Méribel with jobs in bus companies and bars. From 2014 Höfflin took part in competitions of the AFP World Tour . The freestyle manager at Swiss-Ski discovered her name by chance on a starting list, was impressed by her skills and immediately accepted her into the national team in 2015. The following summer she went through several months of intensive training in the freestyle water jump center in Mettmenstetten . Due to a torn cruciate ligament , however, she missed the 2015/16 season.
At the beginning of the 2016/17 season, Höfflin achieved two third places in slopestyle at the Cardrona Games in Cardrona, New Zealand . On November 11, 2016, she made her debut in Milan in the Freestyle Skiing World Cup and finished seventh in Big Air. At the World Cup on the Alpe di Siusi on January 28, 2017, she won her first World Cup victory in Slopestyle. Two weeks later in Québec a second place in the slopestyle and a third place in the big air competition followed. At the 2017 World Championships in the Sierra Nevada , Höfflin took fourth place in slopestyle. In April 2017 she became Swiss Champion in Slopestyle and Big Air. She finished the season in tenth place in the overall World Cup, in sixth place in the Big Air World Cup and in first place in the Slopestyle World Cup.
At the beginning of December 2017, Höfflin jumped to second place at the Big Air World Cup in Mönchengladbach . During the 2017/18 World Cup season , she achieved a total of four top 10 results. At the end of January 2018, she won the big air competition at the Winter X Games in Aspen , while she came fourth in the slopestyle. Three weeks later, at the 2018 Winter Olympics in Pyeongchang , she won the gold medal in the slopestyle competition. In March 2018 she won the Slopestyle Spring Battle in Flachauwinkl and in May 2018 she finished fourth in the Big Air at the X-Games Norway in Fornebu . At the end of the season she finished fourth in the Big Air World Cup.
In the 2018/19 World Cup , Höfflin won a slopestyle competition, and she also came second twice. At the 2019 World Championships in Park City , like two years earlier, she again missed a slopestyle medal in fourth place. With a win and a third place in the 2019/20 World Cup , she won the Slopestyle discipline for the second time.