Wanna know what I think? I think that she killed Caylee sometime between the evening of the 15th and the evening of the 16th. Then she either put the body in the trunk, or hid it somewhere in the backyard (sandbox maybe). That sounds pretty risky, though, so I am leaning towards the trunk. After 2 1/2 days, she realized that she needed to put it somewhere else, so she went home when no one was there, backed into the garage and asked the neighbor if she could borrow a shovel. She was going to bury the body in the backyard and dug a little bit (remember from the doc dumps, the small area of disturbed soil in the Anthony's backyard). She probably laid the body down while she was digging, so that once her hole was dug, she could put the body in it, and cover it back up. But after digging a little bit, she realized that it was too much work. So, she scrapped that idea, put the body back into the trunk, drove around the corner and threw it in the woods.