A single search for how to make chloroform on the A's computer, combined with the photo of How to win her over with chloroform, gives me the opinion that KC didn't know what How to win her over with chloroform meant, so she looked it up.
With the high level of chloroform in the trunk, combined with the computer search, I totally agree that it needed to be looked into, because it did seem an odd coincidence.
Where the state failed, is that they wanted the jury to go from a search on the internet for how to make chloroform, three months prior, and add it to an abnormally high level of chloroform in the trunk, and come up with KC made chloroform, murdered Caylee with chloroform, hid all the evidence of making chloroform, and of using chloroform, except for leaving an abnormally high level of chloroform in the trunk.
For me that is not simply 1 + 1 = 2
As always, my entire post is my opinion only.