Nick Kristoff -Here’s Why We Shouldn’t Demean Trump Voters
[T]he liberal impulse has been to demonize anyone at all sympathetic to Donald Trump as a racist and bigot. This has been politically foolish, for it’s difficult to win votes from people you’re ...
You don't actually have to do anything. Just be honest with her and the rest of the family about your political beliefs and call out her cultish behavior. She'll either moderate her ideology enough to be tolerable (at least around you) or she'll throw YOU over, showing how much she really cares about blood. Either way problem solved.