I have to respectfully disagree - the gases/chemicals measured would have been the chemicals/gases released on day1, the g/c released on day 2 and the g/c measured on day 3. These gases/chemical release aren't all on the same day at the same time, there is a sequence in which they're released.
If the ratio of calcium : magnesium is 5 parts to one part after 90 days of decomp, then he is claiming that the he found the ratio to be consistent with 2.6 days of composition after factoring in ambient means which in my opinion, was too high - the means for that particular week was 86 not 95.
You're forgetting too, that an "airtight container" can mean that she wrapped her up in a blanket or a sheet which would after two days leak fluids which would be absorbed into the trunk liner/carpet.
You know, we're talking about someone who plans nothing - she lives her life day by day and has no plans for the future, that she planned a complicated murder scheme is out of character for her. I believe that she wanted her to sleep all afternoon so she wouldn't have to chase her around and amuse her - KC wanted to goof off, not watch a two year old, which no matter how much you love them is tedious and boring. I think she may have given her something to make her sleep, and the little girl probably died in her sleep of cardiac arrthmyia or choked on her vomit.
If she discovered her around 4pm on that day, that would explain the flurry of phone calls to her parents and her brother - when she didn't get an answer it gave her time to think that this was something that wasn't going to be easy to explain - that's when I believe she wrapped her up in something and put her in the trunk to give herself time to think. Would she have left the body in the car for days? Yes, I think so, first, because she seems to be the queen of procrastinators and second, she wouldn't want to think about it until she was forced to, which obviously is the modus operandi of her life - for seven months she denied she was pregnant and probably sought no care for those entire seven months.
Would she have left her in the trunk of the car for several days? I believe she would and I believe she left her in that trunk for at least 5 days until she was forced to do something because of the odour. Unfortunately for her, the fluids that leaked into the carpet continued to deteriorate and just got worse and worse. Once that odour gets into something you can't get it out.
No, I don't believe she had help - I believe that when her parents brought that car home, her mother tried to clean it and the reason it didn't come out was because it had seeped through the carpet to the trunk liner.
Premeditated murder? I don't think she could premeditate lunch, if its anything it's a felony murder - murder in the commission of a felony - she assaulted that child with an illegal substance and a murder occurred during that assault. If she had called 911 immediately she might have plead and gotten a 5 to 10, now she's facing life without parole.