My guess is that Casey got involved on the internet and lost track of Caylee. When she remembered her, it was too late-she had drowned. She panicked, backed her car into the garage, and put her in the trunk. She may have tried to bury her first, but found it was too difficult and time consuming to dig a hole-she was scared and didn't want anyone coming out and seeing her. (I dig out my own gardens with a shovel-I know how hard it can be. And in Florida, you have a high water table-she more than likely hit water 4-6 inches down. I used to live just north of Orlando, and my son hit water every time he tried to dig a hole.) He used to dig a lot of holes, to 'make the water come up'.
After she placed her in the trunk she drove around, not knowing what to do and trying to figure it out, until the body began to smell. The duct tape was probably to keep fluids from running out of the baby's mouth. Especially if she swallowed a lot of water when she drowned.
I doubt if George was there. If I found my grandchild in the pool, I would probably hold her and stand there in shock (at first)-not climb right out. As soon as I recovered from the shock, I would be doing CPR right away and yelling for someone to call for an ambulance. Hopefully, I would be doing that immediately. I believe George would have called for an ambulance, and if it was too late, known it was an accident. The punishment for 'neglect' is far less than the punishment for murder. And most non-guilty people-if it was really an accident-are not afraid to call police. A guilty person, who knows that it is 'their' fault. for getting involved in something that took their attention off the child-would not want to call police.
LE wasn't called, because Casey was scared, and would have had to admit she was on the computer and had forgotten to watch her. And she would be scared, terrified to admit to Cindy that Caylee was dead, because she wasn't watching her. Cindy probably would have killed her.
Although having been none too fond of Cindy in the past, my heart totally went out to her today. I wanted to be able to hug her when she left the stand. As a grandmother-no matter what mistakes I may have made raising my daughters-I cannot imagine or even think I would have been able to do what Cindy did today. That has to be the hardest thing anyone could do. My opinion and my respect for Cindy went up today. While it may have been-and probably was-done to stop the bus coming at them, I felt her testimony was honest, heartbreaking, and difficult.