The trans umbrella casts it's shadow over gender non-conformity
This article is a very plausible explanation of why there has been such a huge rise of teenage girls referring themselves to gender clinics.
Briefly, because 1) organizations have redefined transgender as expressions of behaviour that don't match the stereotypes of society for that gender - so transgender is now a huge category, and 2) there is long-standing evidence that girls are allowed to not fit stereotypes - so there are more of them.