At this point I’ve told her that if the worst should happen with Republicans getting their way and she loses her benefits I don’t plan to help her at all. She’ll be at the mercy of her own decisions. (Something her and my dad have said to my siblings and I a lot growing up.)
I'm curious, what did she say to that?
Sounds like she's in denial. Does she also change the subject when losing an argument?
Anyways, I think you have better chances addressing her denialism than to argue any other political point. As long as someone won't argue in good faith, all other arguements and debates become pointless diversions.