"This was an excellent result given she was riding against girls who are going to the junior world championships.
"It was also her first outing on the track since the national championships in February."
Walker, who also won the open women's section of the Powerco Cycle Tour of Taranaki in early June, has only been actively competing in the sport for a little over 18 months, currently getting out with Hastie for 5am training so she can also attend school and an afternoon job.
"She has rapidly matured as a cyclist, with her tactical awareness up there with the best in her age group," said Hastie.
Walker also competed in road events, coming sixth in the under-20 road race and fifth in the criterium amongst a field of 50 riders.
Next will be the national secondary school championships in Feilding.