If I had a friend who didn't report a child missing for over a month, and then lied-- again-- I'd run, not walk, to the nearest cop shop. There IS no explanation. And, if there is ANY chance that the child is still alive, the sooner information gets to LE, the better.
And, also... why ask KC about it, if everything KC says is a lie?
Also MOST of KC's friends were people whom she hadn't known long. Newish, fairly superficial relationships.
KC seems change friends like she changes boyfriends.
Of the three friends who had a fairly long history with KC-- one was positive (JG) and two were immediately suspicious (Kio and Ryan).
My guess was that Kio and Ryan became suspicious fast BECAUSE they knew that KC is cold and untrustworthy from their shared, longer histories. They just knew her batter than did most people.
But the thing was, Kiomarie thought that Caylee was dead and buried - not that Caylee was alive. So why rush to tell LE this only 4 days into the case when there were only suspicions. It's hard for me to understand making such an impetuous decision about a so-called "best friend" at that point.