Once the forensic science stuff comes into play, which will be soon, they'll prove this wasn't an accident. The defense won't be able to explain away the chloroform, the neighbor guy saying how Casey borrowed a shovel that day, after backing her car into the garage...something she's never done, while her parents were both at work, the lies, internet searches, there's too many things that say she was murdered. Most people don't commit a murder while someone's watching, this is a horrific spectacle and she'll be found guilty. If the jury doesn't give her the death penalty, she'll be put in with the general population and the other criminals will tear her up.