Also possibilities:
-Trump passes away
-Trump leaves the country
-Trump runs but loses, and Haley gets "told you so" status as the GOP likely tosses Trump under the bus for delivering so many consecutive losses (2018, his own in 2020, and to some extent the weak 2022 performance can be attributed to his election denial and the party rallying behind that). If the GOP loses in 2024, then I could easily see the party decide they must go 'beyond Trump', and politicians that consistently looked 'anti-Trump' may be in a strong position in that scenario.
Seeing as she is in her early 50s, which is downright an infant by the standards of the presidential race, she can afford to run a long game of prepping for a likely 2028 race.
Of course if Trump wins in 2024, her political career won't go anywhere, but it's a fair bet to plan for the contingency of him losing.