I don’t think she needs to prove people wrong as she already has. I don’t know your age but I will try to put it in perspective. I raised daughters with values and a sense of right/wrong. Sarah did the same and she shares that message well. My husband stood back and let me take charge as he knew that my message was more effective than his. It is the same scenario. I now have grandchildren. Their parents look to me for advice. They may not agree with my decisions, but they understand them. Sarah has the ability to share a message. She knows that is what the country needs.
What makes you think she would not be a good President ?