Casey is a sociopath who viewed her growing daughter as an impediment to her partying/dating, a potential squealer who would be able to talk soon, and someone who got more attention than Casey herself. And, Caylee was keeping Casey from spending the nights with TonE and her new club friends. Casey knew on June 15th that George was suspicious of her stories and Cindy was planning to put the breaks on the free babysitting and the stealing. Casey was pissed and she was in full "spiteful *****" mode.
This is what I imagine Casey was thinking and doing in those 31 days (posted in an earlier thread; updated based on evidence at trial):
Time to get rid of the kid. Knock her out with that homemade chloroform intended for mom and dad, tape her nose and mouth to ensure she doesn't wake up, hide her in the wheel well of the trunk, and then go hang with TonE. Make mom suffer til you come up with a good story; keep CeeCee (gag me) at bay with the "Caylee's with the nanny" story until you come up with a long term plan. Wonder if TonE's thinking about me right now? Yep, the kids gotta go; it would be way better to eliminate mom and dad and get the house too, but dad's already sleeping with one eye open and mom is like a cockroach; unsquashable. God I hate them; no way they're getting their precious little Caylee and kicking me to curb, no effing way...
Over the next couple of days:
Oh crap, it stinks in this car. Damn kid; it must be the body. Shoulda thought about that. Bummer, having such a good time with TonE and all the club peeps, shopping too, but must get rid of the smell. It's harshing my gig and someone is bound to notice it soon... Time to sneak home to get trash bags and a blanket,will bury the kid in the backyard just like we did with Ginger. Okay, get this overwith. Man, it's heavier than I thought... Wouldn't want to break into the shed for a shovel and have dad call the cops, such a loser. Ah, borrow a shovel from the neighbor dude; he wants me. Oh hell, should have taped the top of the bag, gross stuff spilling on the lawn. Geez it reeks. Just get it done; focus Casey. Hose down the back yard a little and dig a plot before anybody sees you. FFS, the ground is too hard, what to do?. Of course, take the body to the makeshift pet cemetery and hide it. Grab that laundry tote in the corner; gonna have to carry the kid a bit and no way I'm getting that stuff all over me. If I hurry, I can make it to Fusian for happy hour. Well done Casey, now get a move on...
Party, party, party, sex, sex, sex, lie, lie, lie, tattoo... Man, the car still smells. That kid is still causing me problems. Blame it on dumb--s dad hitting a squirrel, in case anybody's noticed. Good one Casey. Must get rid of the car soon though; the stench is getting worse. Ditch it at the Ascott when it's low on gas. Good idea. Park it by the dumpster so the smell doesn't stand out immediately; leave daybook, shoes, doll, etc... so it will appear that I ran out of gas again and me and the kid were stranded and got jacked. Wonder how long it will take for the cops to find the car and notify good ole CeeCee and JoJo? Bet dad will feel like total crap about being such a meiser with the gas in his precious shed.. Lol...By the time the car is identified, I'll be long gone, presumed missing or dead with the kid...Mom and dad will never forgive themselves for driving me away. Better get my party on good before I go on the down low. God I'm smart and such a good liar...
Party, party, party, sex, sex, sex, lie, lie, lie, procrastinate... How rude, busted by mom at TonE's. Nice going Amy, always knew you were jealous of me, I shoulda stolen and sold your car... Hmm, still a possibility - maybe later. God mom's a crazy bit--, just go with her and come back to TonE's later. No way to float the stranded car abduction story now. Use your head Casey; no biggie. Beg mom to give you one more day (and I'll be gone by the time the sun rises). Geez, mom ain't playing; she really called the cops. Oh well, the cops are dumber than dad and Lee. Been telling mom the kid was at the nanny's, so stick with that part of the story and blame it on the nanny, a targeted kidnapping - brilliant, almost as good as a random abduction from the car. Stick to the work story too; it's worked so far and explains the need for the nanny and makes you look a committed young mom. Not good enough for CeeCee though; :unfit", whatevs... Oh, and tell the parents you can't give them all of the details surrounding the kidnapping because it could endanger their lives and you sure as hell won't put them in harm's way. Hee hee, they'll buy it, suckers. Be kinda fun to watch them suffer while they beg me for information and love me for wanting to protect them at all costs. While everyone's looking for the nanny and feeling sorry for me, I'll hit the road, maybe California? Wait about a month and then slip out when the heat dies down; say I'm off to find Caylee... Perfect...
Damn, cops are all over this in a hurry. Not buying my story, losers. Now they want me to take them to my office; hey, why not? Once they see I'm willing to go, they'll believe me and let it go, everybody does. Wow, this Yuri dude is an ahole; who does he think he is? Can't believe they're arresting me for lying; smile for the videographer (glad I'm wearing my new Target hoodie; my *advertiser censored* look killer, wonder if TonE is watching)...
Out of denial and then preservation and a dose of greed, the family starts lying and covering up. 3 years later, Casey and her team of attorneys find a way to make her lies and the questionable characters of her family members work in her favor. Acquittal....
I think it is a fairly simple but extremely twisted case of hate/jealousy + retaliation + immeasurable selfishness = evil.