Welcome Zuckerschnecke! Great post!
I have only quoted a few snips from it that I wanted to comment on...
First, I agree about the "terrible accident" theory. I have always believed that there was some terrible accident (drowning in the grandparents pool?) and Casey either suffered a psychotic break of some sort or - as you so perfectly phrase - is simply so emotionally immature that she is just trying not to get in to trouble.
Second, in reference to the partying pics, I think perhaps it is possible Caylee was "still around" on June 20th (remember Jessie saying he heard her in the background on June 24th), although the statements from Tony's best friend seem to imply the last time they saw Caylee was June 13th.
About the car seat - for our little 3-year-old - we have one in both of our cars, my parents have one in their car, and we gave one to our babysitter so she wouldn't have to keep swapping the seat back and forth (can be risky if you don't get it in nice and tight each time). So, don't know if the location of that particular car seat means much...
Again, great post and welcome to WS! :blowkiss: