AMerci

Tanya Edom's position as the Crown Princess is revoked by her fiance, Crown Prince Malek, and she is replaced by his lover, Lady Celeste. 
Tanya was head over heels in love with the Prince and wanted to become an Empress worthy of him more than anything. She did everything she could to impress him but her efforts failed to draw his attention in the end

Devasted, Tanya doesn't know what to do, all her life she'd been working toward becoming the future Empress of the Empire, and now her dream had been taken away. 
However, after overhearing palace servants gossiping about her demotion, she realizes that her obsession with the prince and being Empress are dreams she should put to rest and try to do something else with her life.

Doing so leads her to get warped up in a conspiracy concerning the crown. She ends up helping the Imperial Army solve a mystery concerning mysterious letters being sent across the empire.

Rejected Crown Princess To Imperial Cryptographer

Tanya smiled and nodded in understanding what Madea meant. In a way Mead and her were in the same boat. She didn't have any friends herself aside from the three at the palace; her former lady-in-waiting and the librarians. As Crown Princess, she couldn't spend her youth time the way other noble ladies did. Most noble ladies would spend their time going to parties and gatherings to make themselves known in high society and to give themselves the best chance to finding a spouse. In the process making many friendships and connections along the way.

As Tanya already had a fiancé and had to focus on her princess duties, she couldn't do that. Which is why she often felt lonely. Of course, when her parents were around it certainly helped but when they had to go on business trips it was difficult. When they passed away that's when Tanya really went through it.

"Shall we go home now?" Madea asked.

You regret your decision