Great Britain's Paula Walker has admitted that she is not sure where her performance went wrong in the bobsleigh with partner Rebekah Wilson.
The British pair finished 12th in the event after all four heats, 3.63 seconds behind Canada's Kaillie Humphries and Heather Moyse, who won gold.
"I don't know what went wrong really," Walker told BBC Sport.
"I had a horrible third run and it hasn't got much better, we just need to move on and think about the next Olympics."
Wilson said on Tuesday that the pair were targeting a top 10 finish after the first two heats.
