Competing on the spectacular hand cut ice on the natural St Moritz track, the QAS athlete put down four great runs to finish just two tenths of a second shy of the podium.
The combined total time for Walker's four runs was 4:45.77, which had her finish 0.92 seconds behind event winner Laura Nolte of Germany, with American Kaillie Humphries in second and Lisa Buckwitz of Germany in third.
"The week was really great, we had really good training figuring out the track because it changes a little bit each year," said the 2022 Olympian.
"We had a really good plan with lot's of help from the OWIA and my team, which all came together quite well so I felt very prepared for the race on the weekend."
"With the longer four run format, you have to just take it run by run, I was happy with how I executed each run.
"I had a plan with my coach and my team, and we really stuck to that plan and I am happy with how it ended up and the results at the end of the day."