Anyone of any intelligence should realize that there is no such thing as "off the record", "Just between you and me or Just between us", or "Private" anymore. Maybe there are a few times people can get by with it but with politicians, it's almost never. Hillary was caught with her Deplorables remark and Romney with his remark about what percentage of the electorate he'd never get to vote for him which was of course construed by the media to be totally different than what he meant it to mean. Nikki, I hope, realized that what she said would get out.
I particularly liked the part where she led the Chinese, and North Koreans (by the way) to believe Trump was some unhinged lunatic capable of anything, but she didn't know exactly what he was going to do. Maybe she didn't but you can bet that characterization of him may have had some effect that got Kim Jung Un to meet him and began talks with the United States representatives. Actually, when you think about it, regardless of how much truth there may be in any of the statements, it's amusing.