Nikki Haley herself is a very extreme candidate, so I’m not sure “respectable” is the right word.
Her positions:
Supports a federal abortion ban, with no exceptions for IVF
Supports rolling back all action against climate change
"Don’t say gay" law isn’t extreme enough for her
Supports discrimination against trans people
Supports cuts to medicare and social security
Against fiscal support during the pandemic
Against labor unions
Wouldn’t admit that the civil war was about slavery until she eventually relented due to a week of pressure, but even then claimed that “The US has never been a racist country.”