If women want to fight back against this there's one method that's been discussed before... the circumgender strategy. What happens when a real woman says "I'm a trans woman"? With her new "trans" identity, she can argue the need to respect spaces for natal women, not pressure children into transition, etc. She doesn't even have to admit she's a natal woman, just say "yes I am a woman, a real woman, like any other trans woman is."
This forces trans activists into a corner; if they declare that she's not a trans woman on the basis of her views, she can ask what the criteria are for being "really trans," she can call them out for transphobia, etc. If they say natal women can't be trans women, she can ask how they know she's a natal woman, say how dare they attack her for passing, accuse them of reducing people to body parts, etc.