Here are a couple of scenarios as to what the jury had to deal with:
Casey was shown to be a good mother by all of the witness testimony. There were never any prior child abuse charges or suspicions; the child, Caylee, was well clothed, well fed, etc. Of course the grandmother and grandfather provided the financial means to do this but never the less Casey all in all treated her daughter well and they had an "amazing" relationship according to one witness.
It was shown that there was a definite dysfunction within the family. Cindy, Casey's mother, was shown to be an overbearing mother in many respects but at the same time she enabled Casey's dishonest behavior long before the child died. Casey was pregnant for 7 and half months before telling Cindy and her father George. Casey's parents kept it hush-hush until the birth and her brother was kept out of the loop as well. There is early precedent that this family kept secrets and encouraged this dishonest behavior; this is what Casey was brought up with.
There was testimony in which Cindy was rather hard on Casey and her responsibilities as a mother. Casey seemed desperate not to disappoint her mother and went to great extremes to come across in a good light. Lying about two jobs, one of which her parents knew was a lie. Cindy never called her on this fact, again enabling this behavior. Cindy took care of the child quite often and told Casey at one point she would take custody if Casey didn't get it together. There was a fear by Casey to not disappoint her mother; there was pressure to get her act together and to prove her wrong.
Cut to the day Caylee died and one possible scenario.
George, Casey’s father, left for work early afternoon leaving the home empty. Casey had left earlier with her daughter but it was shown she never left the area, known because of cell phone tower records. Casey came back home after George left. Caylee was asking her mother to go swimming so Casey took her swimming for 20 minutes or so then took Caylee back into the home, but Casey forgot to put the ladder to the pool away. At some point Casey possibly took a nap, smoked a joint, or got distracted around the home. Eventually Casey noticed that Caylee was missing and searched the home. Walking outside she sees her daughter floating in the pool and dead. Casey knows it is her fault that she forgot to put the ladder away and completely loses her mind. What will her mother and father say? How can she live with this guilt? She goes back to what she's learned her whole life, lie and pretend it didn't happen.
At this point Casey has two options, face the wrath of her mother and family and call 911 or try to hide the fact that she was completely irresponsible. She chose to hide her mistake. Casey then gathered the body and put Caylee in the trunk. Casey closed her mind to the reality of what just happened and entered her fantasy world; she needed to be comforted by her new boyfriend to make the pain go away. What she demonstrated is beyond denial but I never said we were dealing with a mentally stable person.
After a couple of days, Casey knew she needed to get the body of her daughter out of the trunk, she had to face the fact that if she wanted to hide this from her mother, the body needed to be disposed of. It was the middle of June and the temperatures in the trunk expedited the decomposition of the body and were already starting to smell. Casey went to her home while her parents were at work. She notices that body fluid was starting to seep out of the mouth and nose so she took duct tape and placed it over the face to keep the fluids from leaking. She finished packing the body in a blanket, plastic bags, duct tape, and the laundry bag. Casey went to the neighbors to borrow a shovel and planned to bury the child in the back yard next to the play house. Upon realizing that this was probably not the best idea she returned the shovel to the neighbor. Casey in a panic decided to dispose the body in the woods nearby the home. A few days later, by sheer luck, there was a tropical storm that hit the area and submerged the area in water for several months.
One thing that always struck me was why Casey not picked up her car that had run out of gas on June 28th and it was left in the parking lot of a shopping center. This is what led to her being discovered by her parents that she was not where she said she was. My take, the car smelled of decomposition and if she went to get the car, the smell would remind her of reality so she subconsciously avoided going back to the car.
Out of sight, out of mind, hoping to hold off her mother for as long as she could and remain in her fantasy world.
The continued lie after the child was reported missing were a self-defense mechanism to keep the fantasy alive and avoid having to face the wrath and disappointment of her mother and to avoid her feelings of guilt. She felt she deserved to be punished for her mistake, even willing to take a 1st degree murder wrap for it, but couldn’t admit to herself or to her mother that it was her fault that Caylee died due to her irresponsibility.
OR…..
Casey wanted to hang out with her boyfriend and took chloroform or gave her some drugs to temporarily put her daughter to sleep. The child accidentally died, yet still its felony murder.
OR….
Casey premeditated the death of her daughter so she could be free. 1st degree murder.
Any scenario, Casey has some metal health issues, but the evidence presented by the prosecution shows any one of my scenarios is possible. Obviously the jury thought so as well.