Relative to South America, Germany is going to feel very unfriendly. I think it's a matter of perspective. Also, countries that are very homogeneous (ie everyone looks the same) are probably going to have some ethnic ideas built in their idea of citizenship so your citizenship will be question if you don't look like them or behave like them. South America and Germany are very different regions culturally sitting at opposite ends of most cultural traits so her experience isn't surprising.