Her events are open to women of any political viewpoint.
That's a very deliberate decision because she believes gender ideology is something that affects women as women, irrespective of their political, religious, philosophical, or other viewpoints.
She is not creating a political party. She is talking about women, people with women's bodies. Who will be affected potentially, or their children will be affected.
Do you think people who are fascists, or otherwise politically undesirable, should be barred from trying to protect their kids from medical exploitation?
I'd suggest to you that no matter how wrong that particular political belief is, once you start barring people who think that way from the most basic elements of civil life, and restricting their ability to participate in society or look out for their kids, you have already undermined the political institutions you are trying to protect.