The babysitter may have been wanting to snatch Caylee and saw the opportunity when Casey never showed up. Or Caylee may have been abused, there is speculation about that, and the babysitter believes that she is protecting her. I do have other cases like this, at least two, I am scouring my files for them. I think the child was younger, but the basic premise is the same.
It is possible. However, then you have to dismiss all the lies, ALL the lies, the smell in the car, the partying after the alleged kidnapping, followed by the complete lack of emotion from Casey, her loving "perfect" mom, just to name a few.
I wish I could say that I thought this precious girl was "only" kidnapped. I just don't see it.