That particular anecdote makes me feel like NK said it in jest. It's not that I am giving her a pass for anything, but that may sound worse than it was, especially since we have so much more information now. He had told NK that SW had left and he wasn't acting particularly worried about it. At that point, he was still acting like she just got mad and was either trying to get back at him for something or wanted to "decompress." I took NK's comment about pawning the ring as kind of a snide remark. "Well if she's going to run off on you then just sell her ring, ha ha." That kind of thing. My parents are divorced. I don't want my mom's wedding ring with my dad. It's meant to be a symbol of love and commitment. There are other pieces of jewelry I'd like to have of hers, but not her wedding ring from a failed marriage. On the other hand, if it's a family heirloom, then that's a different story.
I am sure someone will read this and think I am defending NK, but I'm not. I still think she did a lot of heinous things. THIS story, however, is something I can find a little more reasonable. NK reacted to the things that CW told her about the situation. She didn't know SW was dead, that he'd killed her and removed the rings from her dead body.
It was mean spirited, but I don't think it implies that she knew more about THAT situation than she claimed.