It´s weird that Cindy does call her daughter a sociopath but still she talks about what a good mother she was.
And even if Casey is carrying psychological problems why hasn´t her parents then tried to put her in therapy?
There are some issues that all the therapy in the world will not help, and sociopathy is one of them.
I have a son who I believe is a textbook sociopath. He was never abused, mentally or physically, and was raised up going to church, with loving parents and grandparents. In a nutshell, I spent 18 years trying to figure out why this child would not tell the truth, even when all the evidence in the world pointed out that he was lying. Why could we confront him with this evidence, and STILL be told the lies. It was only about a year ago, when I read up on sociopaths, that I realized that he fit the descriptions, and that it was not something I had done in raising him.
Some people are just wired that way, and NOTHING can change it. (he went to several therapists, spent hours in therapy, was even medicated, we tried everything in our power and he still to this day lies to everyone about everything.)
Also, sociopaths are not about being alone, some sociopaths are the most charming people imaginable.