Rationally, you are correct; no one is going to logically argue her out of opinions she did not arrive at logically in the first place. But psychologically, if she gets enough negative feedback when she says or does something stupid, she may stop doing it. This would probably just be a surface behavioral change, but it might, might I say, force a corresponding change in her internalized beliefs.
OC is a worthless, ignorant anti-Free-America wretch. There is no redemption for her. It is a waste of time to attempt to engage her in logical “discussion”. She is worthy of 24/7 ridicule and shunning. She is a malignancy on civil society.