Re: My main regret ...
That's a bit defeatist. Not the conclusion, I think she's completely right that there's no point in her meeting him, but the reasoning.
It is possible to change Trump's mind with science. Bill Gates famously talked him out of being anti-vax. But it's not possible on this specific issue, because it would be politically inconvenient for him to be converted. Truth is irrelevant, all that matters to him is winning.