I don't think she put Caylee in the trunk while she was alive, any dumb person would know the kid would suffocate. I think she put her to sleep and left her in the backseat of the car often, maybe parking her car in a garage of remote area. I am very curious to know when was the last time anyone saw Casey driving her car also, where did Casey park the car at night while she was at Tony's place.
I really feel that when Tony was away in NY and Casey had no place to sleep, she slept in her car and possibly did this often with Caylee, often enough so Caylee didn't find it strange to sleep in a car. Maybe she gave her cough medicine to help her sleep and maybe something went wrong.
I think once she found the kid dead she called someone, someone close enough that would help her sort it out, a lover, a father? I think she put Caylee in the trunk until she had that someone in person to help her, and THAT PERSON SURE helped her hide that body REAL well.
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That's what I said I thought, days ago. It's so difficult to follow the posts here--it would be a full-time job. And I continue to think it intuitively.