Leave her. She is brainwashed and you are awake. You can't get un-woke. Stop taking advantage of her. If you wanted to marry her, you would have secured that arrangement already.
My mom had a house mate that moved out without a word after Trump won. That stupid witch could not handle that she lost after everyone said they had a 98% chance, gas-lighted and brainwashed.
This person you are with may have hope, but not with you. There's nothing left for her with you. Stop using her for sex, and find yourself a partner.