That would expose her to the others, so obviously she doesn't manifest her blocks to everyone, she just configures her servers to drop packets received from specific origins.

It used to work directly and now it doesn't.

It works via foreign proxy/VPN, but I'll just stop visiting her site from now until she stops with her racism.

So you have absolutely no proof this is racism, and calling it racism is just your petulant response to something you don't like. Got it.

How is that not racism if it's discrimination by origin of requests?

I bet money she doesn't block requests by such a wide filter if the origin is USA.