I'll see if I can answer some of this a little bit, I quoted your original post but don't know how to break it into sections, so I'm going to copy/paste here, your questions in quotes and italics, my answers below in bold:
"Their daughter basically ups and leaves after living with them all that time. Missing for 31 days and no one asks the obvious question? Where's little CA?
They don't immediately hem Casey up in a corner and demand to see their grandbaby? After 2 days being gone they should have been asking."
They did ask where she was, every single of those 31 days. Cindy was in constant phone contact with Casey, who continually spun lie after lie, story after story. She said she was in Bush Gardens for a few days, she said she went to see her friend Jeffrey for a few days in Tampa, this went on for a month. At one point,
she did come home and George caught her, and that was the infamous "here's your effing gas cans!" incident. But for sure, they did ask every day where Caylee was. It wasn't until they picked up the car on the 31st day that they finally decided to do something about it.
"How long did she drive around with that precious baby's body in her car to get the smell and stain THAT imbedded into the car and trunk? It had to be for a week at least. Did no one notice a smell coming from her car in parking lots and such?"
She drove around with Caylee in the trunk for 5 days, from the day of the death until she dumped the car at the Amscot and abandoned it. She, herself, DID notice the smell, that's why she texted her friend Amy and told her that her dad had hit a squirrel and the car smelled from like dead animal. Cover story. Eventually she couldn't take the smell herself, and then abandoned it at the Amscot. It was towed from there a few days later. The tow truck driver said that he'd been sick and had a bad cold and didn't really notice the smell. But George did, as soon as he picked the car up. Upon finding the bag of trash in the trunk,
he at first attributed the smell to that.
"Something that bothered me during the show was they kept referring to multiple bags at the crime scene. Was CA actually in pieces? I can't remember that from before and during the trial. "
She was actually in pieces. The multiple bags is that she was wrapped in a Winnie the Pooh blanket, then put into a canvas laundry bag, then two garbage bags over that. Animals had drug her little body around the area and bones were found in several places
"Why did the grandparents NEVER meet this Zanny the Nanny? "
The simple answer is, because you can't meet a non-existent person. The complicated answer is because they just didn't press it hard enough. Cindy THOUGHT she had a phone number for Zanny, and Cindy THOUGHT Casey had gotten a flat iron from Zanny, but that was all it took to convince Cindy for 2 years that she was a real person.
"I think CA passed out from partying and only realized too late that her baby girl was left all night and possibly a day in the trunk due to intoxication or being on drugs. When she realized it she had to think up something quick. That's when she stopped living at home."
Remember that George had seen Casey and Caylee leave the house together around noon/1pm on the Monday after Father's Day, and by that afternoon,
Casey was on video with Tony at the Blockbuster. Also, her cell phone shows a massive flurry of activity just before 4pm, unanswered calls to both George and Cindy. It was some time during these couple of hours or so that the baby died. So Casey wasn't passed out from partying and she most certainly didn't do it by accident. I'll never be convinced it was anything other than a rage induced pre meditated murder