I just came to this thread, haven't read much and saw this post. Last night, after reading Lee's deposition, I had the above thought as well. No let's call it a horrifing realization.
To expand here - CA had gone to the counselor. She was trying to crack down to bring change regarding KC's lack of responsibility. KC, always the spoiled brat, entered into an I'LL SHOW YOU MODE. NOONE TELLS ME WHAT TO DO!!!! I'M SICK OF YOU POLICING ME AND CONTROLLING ME AND FOREVER TELLING ME WHAT I SHOULD BE DOING. Unfortunately for Caylee, she was the central factor that could not be ignored keeping the "control" always "alive and well". Once KC took care of the "control factor = Caylee" she solved her problem in her sick mind.
Further weird psych would be that CA , forever confusing herself with being Caylee's actual mom, caused KC to THINK she was being relegated the position of the Nanny, while, in fact, she was the mom. Resentment had built up big time. KC had no problem relegating responsibility but wanted it both ways, her cake and eat it too so-to-speak. But so did CA.
Therefore, I conclude that KC's self described words are true; "I did this because I am one spiteful





." IMO, she feels justified.
Since then, everything is back to "normal". They A's are busy obeying and placating KC.
Sorry if my post went too off topic. I think Timer55 could concur with trip to P.R. but not so much Caylee's murder.