Okay, I'll take my best guess:
ICA can't go to Mt. Dora for Father's Day because she knows SP is still PO'd at her. When she comes home CA and Caylee are in the pool. She wants to join them, Cindy says they're getting out, she takes it as rejection. They go in and watch the Mt. Dora video with lots of "oh, grandpa just loved Caylee," and "isn't she cute" and "she was soo well behaved, etc." ICA sees Caylee as usurping her role of "princess" in the family. I think she's been kicking it around for some time, but this night seals it.
Next day she gets ready to go to "work." Says goodbye to GA. Drives around and Caylee falls asleep in the car for an afternoon nap. Parks her car in her usual "stakeout" spot on suburban (later body site), so she can watch for GA's car leaving house at 2:30. Goes back to house. Gets a call from Jesse before she can carry out her plan. Talks for a few minutes, acts like everything is normal. When George beeps in it's a good excuse to get Jesse off the phone. Don't know if there was chloroform involved but I think Caylee was sedated and then suffocated in the bedroom. The original plan was probably to leave her in Jay Blanchard Park or something and make it look like a kidnapping. But she gets too nervous about that and decides to just bury her in the yard. Brings Caylee out and puts her in the playhouse and starts digging, but then it starts to rain. Now what? Goes inside to think. Calls TonE. The storm is only getting worse, so plan B, leave her in the covered sandbox. Frantically calling CA as she pulls out of the driveway to make sure she really is working late. But coast is clear and fun awaits with TonE.
Next day back to the house to figure this situation out. Ugh! neighbor is outside working in his yard. Figures. Asks him to borrow the shovel so she can give him the bamboo root story just in case. Waits and waits for him to go back in his house. The sandbox is worse than she expected. She realizes she needs a garbage bag. It's not easy but she wraps Caylee up and by the time she's done she is sick. She's running out of time again and leaves her there one more day.
The next day there is no more room to play around. She backs up the car and gets the bag and drags it to the trunk. As she is lifting it into the trunk she realizes the bag is ripped. It spills all over her pants and all in the trunk. She is physically sick. She takes a shower and tosses her smelly pants in the trunk so Cindy won't find them. She also adds more garbage bags and the laundry bag.
I think she puts Caylee on Suburban between this day and the 24th before the gas can incident with George. I think at some point she tries to clean the trunk or spray something in it because it smells. I think this is on the 24th or 25th. Because I think when she goes to clean the trunk she removes her 2 pair of shoes and pants from the trunk and throws them in the backseat. She doesn't realize that these items smell as much as the trunk does. This is when her car starts to smell, and only gets worse over those hot Florida days. She thinks the smell is coming from the trunk and no matter how much she cleans it the smell still comes back. (Lady MacBeth, anyone?) She throws the garbage bags in the trunk to disguise it as trash smell and dumps the car.