Susanann is not a troll; she holds her beliefs sincerely, and isn’t trying to get a fight going just for the fun of it.
But she is an irrational, illogical, clueless idiot. Watching others take her on in the Parents of Young Children: Do You Worry About Their Future? thread, all I could think of was, it’s exactly how it always went when we would try to use logic and evidence in an argument with my mother. It’s rarely if ever worked with Mom in the past half-century, and it’s not likely to work with Susanann either.
Really, best to just work around her, rather than take her on. Even when she’s wildly wrong, you’re not going to show her the error of her ways; she’ll just find a new way for the argument you’re having with her to get even more stupid and (for you) more frustrating.
Just let her be wrong on the Internet. That way, a stupid Susanann post like the one at #8 in the linked thread won’t wind up taking over what otherwise might’ve been an interesting discussion.