As she was born in Canada, her nationality is obviously Canadian.
Her ethnicity is however not official at this time but it seems like she is white.
Green has written a song in response to the "amateur commentators" who hide behind anonymous comments about Miller.
In fact, she won the "Miss Junior Dance of Canada" title when she was 13.
Later after finishing her high school, she moved to Los Angeles in order to pursue another childhood dream and that was acting.
Leah returned to Canada after struggling in the city for few years.
He has written about their personal lives before, including the single 2011 "Fragile Bird," which he has explained in interviews is about her struggle with night terrors.
But "Commentators" is about more than Miller, or any one tweet.