Under The Moon-Book 1

When one girl is mated to two girls, it is fate.
When her mates and herself turn out to be royalty, they were born by one of the 4 queens.
When Ember turns 17 years old her parents who always knew she was a lost but yet found princess, they tell the truth.

Ember is 16 and she hasn't shifted but her parents say that it is normal not to shift. But it isn't.