After graduating from Brunel University London with a degree in sports psychology, she moved to train at Loughborough in 2017 to work with Rob Denmark.

[4][2][5] Courtney made big improvements to her 800 m and 1500 m bests in 2013 and won the latter event at the BUCS Championships indoor and out that year.

[6] She teamed up with Cameron Boyek, Sarah McDonald, and Tom Marshall to take the gold medal in the inaugural mixed relay event at the 2017 European Cross Country Championships.

[8] Courtney was chosen to represent Wales at the 2018 Commonwealth Games and she won 1500 m bronze medal in a personal best time of 4:03.44 minutes, beaten only by Caster Semenya and Beatrice Chepkoech.

In March that year, she took bronze over the same distance at the European Indoor Championships, setting her personal best in the process.