In April 2012, Sexton competed at the Canadian Half Marathon Championships in Montreal, finishing second behind Kate Bazely.
[7][8] In 2022, Sexton was selected for her first national team, representing Canada in the marathon at the 2022 World Athletics Championships in Eugene, Oregon.
In lieu of the marathon, Sexton focused on the 5000 m, running a personal best of 15:27.70 in Portland on June 4 and placing third behind Briana Scott and Julie-Anne Staehli at the Canadian Championships.
On January 14, Sexton entered the Houston Marathon with the aim of hitting the Olympic qualifying standard of 2:26:50.
[11] In March, Sexton was selected to represent Canada at the 2024 World Cross Country Championships in Belgade, Serbia.