It made me think that Cindy was passing on a possible scenario to KC to approve. Like this:
I think it could be KC let Caylee drown in the pool while she was busy texting Tony. Father was not involved, she bought Caylee into the house and hid her somehow in her own bedroom (water in bedroom from pool), she came back the next day to find Caylee had undergone the death sigh (jaw falls open even if closed at death due to gases) she then tapes her jaw closed tightly and puts a heart shaped sticker over her mouth and hides her in the garden.
She returns the next day to move her to the trunk of her car until the smell gets overwhelming, she then buries her. Liquid from the body spills into the car on removal and shortly thereafter the decomp continues eventually making it impossible drive, she abandons car.
Accident defense.