Here's an out there theory. Maybe all the searches were never about Caylee, per se but rather Casey pondering the idea of knocking off mom and dad. Maybe the self defense, household weapons, chloroform, searches were her trying to figure out how to get rid of the A s who were asking too many questions. The chloroform as a means to subdue two adults so they could be murdered with little need to worry about them trying to defend themselves or living to tell the tale of the attempt?
Perhaps the fictitious jobs were becoming too difficult to upkeep and the idea of having the house and whatever life insurance/inheritance may be hers was very tempting. Casey likes money she doesn't have to earn. Casey and CA have a rocky relationship at best. GA is asking a lot of questions about the employment situation. CA and GA are maybe headed for divorce. Why not just get them out of her hair and then she is on easy street?
Caylee is a big inconvenience. I have long thought that the only use Casey had for Caylee was as a tool to be used in the manipulation of the A s. If the A s are out of the picture, Caylee becomes way more inconvenient than useful. I think, although she may not have thought that far ahead (to premeditated murder of Caylee), that she was indeed thinking about that for her parents. I also think, if she had been successful in killing her parents, Caylee would not have been far behind, either through neglect or out and out premeditated murder.
I think Casey wanted to go out and run. She wanted to spend time with her loverman. Caylee was inconvenient but mom and dad weren't gonna watch the kid while she gallavanted so she attempted to drug Caylee just enough to knock her out and keep her quite. All those internet searches on chloroform had given her an idea. I think she may have even duct taped her little mouth and secreted her in the trunk the night of the 16th, expecting to remove a living but very groggy Caylee later. Instead found a very dead Caylee dead and went into panic mode.
I don't think she contemplated having to get rid of her parent's bodies in her half baked maybe plan of offing them. They were probably going to be the victims of a home invasion gone awry on a night when ICA was "elsewhere" Now she's got two parents still up her butt and a dead child in her trunk to explain. This could explain why she drove around with her deceased child in her trunk for a while. Trying to figure out what to do with her and how to salvage her actual plan.
What if the searches started out as one premeditated thing and before being useful for THAT thing ended up throwing the whole plan out of alignment with the unintentional death of Caylee?
Okay, now pick it apart guys, I know the Caylee team here at WS will find any flaws in my theory for me.
Too bad JB doesn't have a team doing that for him, oh yeah, he does, lol.
But you guys are so much better at this than the DT