When all of this started, I felt Casey was guilty right away (MOO!) and I thought that it probably was an accident (she left her in the hot car - she forgot her in the car while she was partying- or something else accidental happened) BUT now that I have watched this circus for the past few weeks I am convinced that Casey premeditated the entire thing.
Anyone with that type of personality likes being the center of attention and I'm sure, when she got pregnant, she got plently of love and attention (baby showers, doc visits, family doting on her...) And that probably didn't change while Caylee was an infant. Now, fast forward and Caylee is about to turn three and has her own personality, is a little person now with her own wants and needs and people always ask for 'Caylee' and Casey said herself from behind bars...All they care about is Caylee (sorry dont have the exact quote!).
I think Casey wanted to put the attention back on herself and wanted to be free. Most of us 'normal' people realize that she could just leave Casey with her parents and they would've probably been happy to raise her but she thought the 'disappearance' would bring more sympathy and attention to her...sick, but I've know people like Casey (had a very good friend who couldn't go a day without lying about something!) and Casey is EATING this attention up. She won't be as excited when they lock her @ss up for good!