I believe it is common practice at uncontested conventions with a clear winner, for the also-rans to release their delegates in order to give the nominee a unanimous victory. I wouldn’t read too much into this.
McCain released his delegates at the 2000 Republican convention so they could vote for Bush. This is a common practice at conventions, done to show unity. I guess Nikki’s run the anti-Trump grift for all it’s worth. There’s no money in it any more and with Joe imploding, any continued divisiveness on her part will only destroy whatever remaining credibility she may still have.