The Herbwitch Princess by Ireen Chau

This book should be read after The Herbwitch’s Apprentice.

A betrothal to quell a rebellion…

Lady Narcissa Greenwood has been haunted by her past since the disaster of last summer’s Season. The society she once reveled in now sees her as the traitor’s daughter. Narcissa fears she can never prove them wrong.
But when rising anti-witch riots lead to her betrothal to Crown Prince Bennett and a grand kingdom tour, Narcissa seizes the chance to atone her mistakes. She is determined to become the dutiful crown princess—even if her stoic fiancé is less than eager to play the loving couple.
However, the crown prince isn’t as unaffected as he seems. Amidst Olderea’s flax fields, bustling marketplaces, and whispers of rebellion, Narcissa must decide whether her past should hinder her future—and whether duty, love, and redemption are separate things after all.