She won the gold medal in the women's 10 kilometres standing event at the 2022 Winter Paralympics held in Beijing, China.

At the 2012 World Cup in Vuokatti, Finland in the 12.5 km biathlon event, Buy won a bronze medal.

At the 2021 World Para Snow Sports Championships in biathlon, Buy won the silver medal in the women's 10 km standing biathlon event.

[2][3] She also won the gold medal in the women's 12.5 km standing biathlon event.

She won the gold medal in the women's 10 kilometres standing event at the 2022 Winter Paralympics held in Beijing, China.