There is no risk for her so bravery required is zero. If you want brave 16 years old - search for them in Hong Kong protests and the like.
At her age, and probably even more now, I'd be scared about how the media, politicians, neighbours, peers, and social media would treat me after such a speech.
We had teen driven revolutions and riots agains governments in the last decade. The least proteser at Gezi park was braver than her. Ditto for arab spring, Venezuela and now against Putin.