Shatter Every Window Until It's All... (Movie Lloyd x Reader)

There were 6 Ninja protecting the city from Garmadon. Until a seventh showed up and caused an uproar. Why did it shock everyone? The new ninja is unknown, unallied and controls the wind.
Garmadon can't beat her, the ninja can't catch her, she is clearly out of everyone's league, but the question remains, who is the new Ninja/ Master of Wind.