She started BMX, inspired by watching her cousins racing, when she was six years-old.
[2] She attended Cambridge Middle School and was a prolific winner at age-group level.
[3] She has won her sixth consecutive age-group world title in 2018 at the age of 13 years-old.
[4] Walker won on her debut in the junior elite competition at the UCI BMX Racing World Cup round in Bogotá.
[6] Competing at the UCI BMX World Championships in Rock Hill, South Carolina, she finished seventh in the elite grand final, which earned a Paris Olympic Games qualification spot for New Zealand.