Statistically mothers dump their murdered children close to home whereas fathers dump them farther from home. Casey did what most mothers do when they kill their child.
There were a lot of cell phone pings in the airport area. LE established a pattern and this was unusual for her. There were lots of places to dump a body there and that's why a lot of searches were conducted in that area. Maybe her plan was to dump Caylee there but for whatever reason she changed her mind.
The decomp in the car was 2.7 days I believe, not a week.
Lastly, Casey is no criminal genius. She got caught all the time stealing, lying, etc. She doesn't plan anything. Most murderers get caught, there is no perfect crime.
Casey was stealing money out of Caylee's piggy bank and gas out of the shed--kind of puts it in perspective how desperate she was to get money. She may have simply not had enough gas to dump Caylee farther from home.
Casey and Scott grew up in two different worlds. Scott lived a privileged life, traveled often, and went to college. Casey rarely left Orlando, dropped out of high school, and her family lived from paycheck to paycheck.
IMO
You make some good points, however:
If she didn't plan anything how can we have premeditated murder?
Casey stole enough money in checks to pay for gas, she's just as you said not someone who plans anything. Again I'm not saying premeditated murder requires that she be a criminal genius, I'm saying that it requires SOME degree of planning.
I don't buy the idea that ms highschool dropout decided to google the directions for chloroform, actually make it, then use it, and didn't ask the obvious question of "What do I do with the body?"
I'm on the fence between two theories.
Either:
A) Caylee died of an accident, ex: in the pool. She panics (if memory serves correctly there were a bunch of calls to Cindy's phone just before she disappears), and being a sociopath narcissist decides that it is not in her best interest to call the police as it would threaten her immediate freedom (the irony being that if this is true, she would have walked).
B) Casey was drugging Caylee with Xanax which are often referred to as Zanny pills. Caylee dies, she panics, and doesn't call the police.
If A) is true Casey is guilty of aggravated manslaughter.
If B) is true Casey is guilty of felony 1st degree murder