Okay, she's stupid. I agree with that. But I think she's as good a criminal as any. It's strange how such people can be stupid, but also cunning. She also knew enough to prey only on those persons connected to her--persons who, IMO, she thought were her very own suckers. These were people whom she probably felt she could talk out of going to the police. Her parents... oh, brother! Her grandparents? No worries--her parents would stand between her and any trouble there! Amy...? I can't help but wonder, if Caylee's murder had never happened, would Amy have promptly brought charges, and seen a prosecution all the way through? I can't help but think that in those circumstances, Casey (with her enablers, the parents) would have somehow bought Amy off, and once again she'd have escaped prosecution.
What a typical career she'd have had, as a petty thief, if she hadn't overextended herself with that murder (my opinion only). Of course, in her mind, the crime of murder probably isn't that much different. "When this is over, I have so much to tell you." Heh.