Generally, I think its an attempt to change the focus. So instead of talking about childrens healthcare and that possibly leading to discussion about the way children are treated at school or the whole of trans healthcare, they pick on a detail and try to prove that wrong.
So, instead of talking about children, its become a free speech issue, or the idea that twitter was never the place to have the discussion in the first place.
Maybe that she did talk about this a lot in private, and didnt notice it not being discussed so freely in public?