Walker was impacted by illness for the entire event, the QAS pilot was ninth in monobob during the previous week. Both the two woman and monobob competitions were four-run combined time major championship format over two days.
The pair were 14th fastest in run one, two and three, and in the fourth and final run improved to the 11th best time of the round, posting a four-run combined time of 3:50.75 seconds.
The event winner 4.75 seconds ahead of Walker and Reddingius and leading a German clean sweep were Laura Nolte and Deborah Levi, their teammates Kim Kalicki and Leonie Fiebig were second and Lisa Buckwitz and Kira Lipperheide third.
Australia also competed in the four-man bobsleigh, with pilot Rhys Peters joined by Jermayne Takapautolo, Jack Pennington and Benjamin Forst.
Unfortunately in the first run they crashed just after the halfway point, sliding the remainder of the track to the finish line in 24th.
The Australian sled did complete the run, so they were eligible for a second run, but it was cancelled due to warm conditions. They did not make the result cut for runs three and four.