To add insult to injury, they malign her character to say she would run away to go out with boys. Even if she did do that, she was probably looking for affection however misguided. The poor kid had learning disabilities and required medication.
How could two sisters who probably swore to their dying sister they would care for her daughter end up beating her to death? I don't believe for a minute that the child magically disappeared. If the tote was outside the house then my money is on the older sister going back to the house to dispose of Delia's body permanently. Just the most depraved way to deal with a dead child. Treating her like garbage.
They need to spend a long time in prison.