I totally agree. I think she lost it a long time ago, even before she got arrested. I've never been a fan of hers, but her acting was fine. She seems so fake though, like her other jail time friends.
Then again we can't really blame her. Her family's pretty broken up, she's the eldest child, and the media's constantly on her.
In the end, Paris, Nicole, and Lindsay should all spend a long deserved time in jail together in the same cell. That way, they can realize how irritating they all are.