What a totally disgusting and ridiculous story, that has been going on and on and on...

Here is my deduction on what happened, anyone else agree, or care to offer you own guess?

Mom was at Grandma's with Caley.

Mom got busy on the phone, or with some of her party buddies, and was not keeping a close eye on the child.

The child, got into the swimming pool in the back yard, and drowned.

Mom finds the daughter, and panics, knowing that she is responsible.

She removes the child from the pool, and puts her in the trunk of her car.

As the odor starts to become evident in a couple of days, she borrows the shovel from the neighbor, and takes the child somewhere and puts her in the ground.

This is what she means when she says that Caley is "close".