If trump croaks or goes to jail or the scotus declares him ineligible then haleys second places win at 40-45% give her a pretty convincing argument as to why she should be the replacement nominee instead.
There is no way Trump would ever pick a non white person, nor would he pick a woman, well unless she was hot and he would use the promise of being VP to sleep with her.
For real - I am roughly 100% sure the only way he’d let a woman on to his ticket as the VP nomination is if the woman in question agreed to let Trump fuck her on demand.