MaJoC, I confess to being confused about the primary and caucus voting to choose party candidates but I did hear about this on the Planet America show I mentioned. I just found this article which explains why Haley chose not to be on the primary ballot because there was also a caucus vote. Reading the whole article helped me to get a bit more clarity about the primary and caucus voting:

Nikki Haley loses to 'none of these candidates' in the Nevada GOP primary

"Nikki Haley faced no major challenger Tuesday in Nevada’s presidential primary.

"She still lost, according to NBC News projections.

"Nevada voters in the state-run primary had a choice to reject all the candidates on the ballot, and they did just that — with more people choosing to vote for “none of these candidates” than for Haley.

"Former President Donald Trump, far and away the front-runner for the Republican nomination, wasn’t on the same ballot as Haley because he is set to compete in party-run caucuses Thursday.

"It was a stinging rebuke of Haley, the former U.S. ambassador to the United Nations and South Carolina governor — and one that some party leaders had encouraged. The outcome in Nevada was Haley's third consecutive loss in an early-state primary contest.

"Still, Haley's campaign indicated that the results wouldn't affect how long she'd stay in the race.

"'Even Donald Trump knows that when you play penny slots, the house wins. We didn’t bother to play a game rigged for Trump. We’re full steam ahead in South Carolina and beyond,' spokesperson Olivia Perez-Cubas said."