Well, if she is an adult there is not much you can do, besides offering some advice. Just do so in a manner that does not paternize her. Other people's choices are something we cannot control, even when they are our kids. Just be patient and supportive with whatever her ideas are, and expllain calmly why you feel differently. 

 I was thinking of how to reply, then you made a note that was the perfect answer. Just swap out the word “America” and “it’s”with “my.”

“I understand that America's greatness depends upon its wisdom, tolerance, compassion, benevolence and for its resolve to settle conflicts and disagreements rationally, fairly, and non violently.”