I think when someone's been through something traumatic there's a need to talk about it. A Netflix documentary wasn't the best place for Caroline to talk but I can see why she did it.
It most likely wasn't for money or because she's a narcissist, but because she wanted to get her side of the story out there.
I expect a lot of people knew about her erratic behaviour, her drug and alcohol problems, and speculated about her whirlwind relationship with Sandy and why she stayed with him. I imagine she saw this as a chance to set the record straight, to say, 'This is what I went through, this is why I made some terrible decisions.'
Obviously it backfired on her because she's just getting even more judgment now.
I did think she took a huge risk in going out to the middle of nowhere to meet Sandy for the first time, I wondered why she wouldn't insist on somewhere halfway in separate hotel rooms for the first time.
Maybe Sandy was looking for someone vulnerable/ lonely/ desperate enough to take that risk, and once she showed him she was then I wouldn't be surprised if he was emotionally manipulative and controlling.
It's interesting that he didn't tell her the whole story of what he did to Tony Parsons at once. First it was that Parsons died immediately and they panicked and buried the body. Then other details, that he was still alive, that they poured bleach over the body etc came out.
I think that was to slowly, piece by piece, make her- not sure if comfortable is the right word but the only one I can think of right now- comfortable with what happened.
He accidentally killed someone, (and Sandy told her Parsons shouldn't have been on the road anyway), panicked and made a bad decision is the kind of thing a vulnerable person who thinks they're in love can wrap their head round, maybe even feel flattered to be entrusted with that secret.
And once she'd accepted that, then she's part of it and could gradually be pulled in deeper.
I think it's easy for us to judge her, but none of us know how we would act in that situation.