Ironically, your entire point seems to validate what she says. Distinctions ARE necessary and they aren’t necessarily bad. Nobody is trying to take anything away from transwomen. That’s not true for ciswomen though. So things transwomen won’t be included in simply because biologically they can’t be or even if you’ve lived as a man- you’ve lived with a privilege that a ciswoman will never know. That distinction should not be ignored and that is what’s happening here.