She competed in the women's event and the mixed relay at the 2018 Commonwealth Games, winning silver medals in both disciplines.

Learmonth won a National Championships freestyle medal whilst competing for the City of Leeds Swimming Club.

[17] In 2020, Learmonth won the inaugural edition of Super League Triathlon Arena Games, held in Rotterdam.

[19] In 2021 Learmonth was part of the gold medal winning triathlon mixed relay team, at the 2020 Summer Olympics in Tokyo.

[23] Learmonth was appointed Member of the Order of the British Empire (MBE) in the 2022 New Year Honours for services to triathlon.