Caylee could have gotten out of the crack that was opened for the dogs. That's what Tracy McLaughlin stated, the door was left open for the dogs to get outside.
Right, she probably got out through the glass door; went up the ladder and drowned. This happened in the early morning hours; but you have to give it to KC, she sure can get over things quickly - within a matter of lets say hours she was uploading pictures on facebook.
I can see how this would play out. After all you never know how someone reacts to finding their child floating in the pooll -uploading on facebook seems plausible to me. What a trooper.