Part of the Achieve programme at Glasgow 2014, which aimed to give young athletes a behind the scenes experience with a view to competing in future Games, Isla put that experience to good use when she made her Commonwealth Games debut at Gold Coast 2018. She competed in the Mountain Bike Cross Country event where she achieved a 5th place finish and also took to the road for Team Scotland in the Road Race.
She went one better at her second Games at Birmingham 2022, finishing 4th in the Women's Mountain Bike Cross-Country final.
Scottish champion in both Mountain Bike and Cyclo-Cross in 2016 and 2017, Isla was also crowned Elite British Mountain Bike Series champion in 2016. She took 4th place at the UCI U23 Mountain Bike World Cup in Val di Sole and finished the series 10th overall.