I'm at a loss how to handle my Trump-supporting sister

My (28) sister (24) has a Catholic Venezuelan fiancé who is an asylee in the US, and she has become a Trump supporter. To her credit she isn't spouting ideology online or aggressively trying to turn anyone, but the fiancé hates trans people (it was like a huge part of his personality for a while) and he and his whole family have slowly converted her. I have been a good big brother to her my whole life: I stopped her from killing herself several times, I've helped to teach her about money and been non-judgmental about her consistently poor life choices. But in this one area, where she said that she voted for Trump, sent me over the edge.

I tried to explain why he's bad for the country, how he meets most definitions of a fascist. Why his words and ideology are so damaging for the country. I showed her his pick for Secretary of Defense and why he's such a bad choice for wanting to fire all "woke" generals and return to 1990s combat standards (no women or gays in combat). I'm in the military so I've paid close attention to the issue. But her response was, "if this is the best evidence you have that [Trump] is a bad pick, I’d have to say it’s not very good evidence." I pushed lots of other issues as reasons he's such a bad pick and she basically attacked me, saying that because I have a good job and found success (coming from the exact same household) I am out of touch with "every day people."

She lives in poverty by her own poor choices, and thinks Trump will fix it somehow. She went to college three times, signed a lease she couldn't live in for 12 months and paid rent that whole time without living there. She's been bailed out by my parents several times, and changed major career paths several times. I have always been over-the-top supportive of her and want to just let this go...but I can't. She's abandoned reason and thinks that the potential for Trump to make her life better is worth all of the damage he promises. A huge part of me wants to essentially avoid contact and become estranged because I can't imagine how to talk to her and avoid the huge elephant in the room. But I also don't want to let politics divide my family, I feel like somehow I'm the crazy one.