She would need to become more cultured and sophisticated, and that would probably mean losing at least some of that folksy charm
I'm sorry you feel that way. I think that in order to be more appealing to more voters, she needs to dial it back on the backwoods colloquialisms and speak plain English, as though she graduated from Harvard Law.
That most definitely does NOT mean abandoning Christian conservative principles in any way, or to any degree. But it does mean presenting those principles in more sophisticated, more presidential ways.