If it was written by a 14-year-old, she's obviously had a GC parent or other influential adult talk to her about this, because of the vocabulary. I don't think many 14-year-olds olds would use the phrase "regressive sexist stereotypes" unless they'd heard it elsewhere.
At least she has listened and taken it on board. Good for her - she must be in a scary place. "It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends."
But reading this, she seems like a drop in the ocean. I keep seeing the phrase "the tide is turning", but it's not really, not while the majority of young people are so captured.
Not sure what the answer is - youth culture is very hard to change from the outside, as it thrives on feeling rebelious and different from the older generation.
Not pandering to it in schools would be a start (well done that teacher for keeping boys out of the girls changing rooms).
What are the government actually DOING about this FFS? They're not without power in this. And probably only two years left to take action.