That is a good point, but I think Haley will play the long game. She can spend the next 4 years writing a book or doing a speaking tour, and just sit back and watch what happens.
Besides, if Trump is elected, how much of a national profile do you think he'd let his VP develop? The only thing I remember of Mike Pence, other than him finally doing the right thing on January 6, was him standing behind Trump at press conferences and gazing at him lovingly. And unless Democrats end up making huge gains- enough to ensure a successful impeachment that would actually remove Trump- if he is reelected I don't see how he wouldn't finish out a full term. Republicans will never vote to remove him, he can quash any federal case against him, and the Supreme Court seems eager to take his side.