Rumpole
Formerly known as "Hercule Poirot"
Thinking some more. If KC finally bagged the body in garbage bag on the 20th she may have thought her problem was largely over or at least "well contained" She may well have continued driving around with the bagged body in the trunk thinking that the smell would now soon go. But it didn't! That could be why she returned on 23rd and 24th.