Bonds of Wings and Fury: Silver Princess by I. T. Lucas

A prophecy still missing its final piece, a mystical flower holding an ancient key, and a princess who seeks knowledge but finds destiny. Driven by a legend of a rare flower with unmatched pharmacological properties, Princess Idrilia pays a terrible cost for her obsession and vows never to risk another life for it. But some quests are impossible to abandon, and the secrets of the Silver Princess go far beyond what legend ever hinted at. Bonds of love and duty are tested by distance and crown politics, and fate rarely unfolds the way prophecy predicts.