Maybe encourage her to look at actions, rather than words? Many find that sort of brash New York attitude quite off-putting, so they're imagining Trump to be meaner or ruder than he really is. If they look at what he really does for Americans they will see him in a better light. There was a thread on reddit (probably deleted for being truthful) about people telling real-life interactions with Trump, and all of them were positive, he was always willing to help someone out and was really kind to everyone, no matter what position they were. Just to help solidify her vote.