Almond 
The Oblivious Saint Can’t Contain Her Power: Forget My Sister! Turns Out I Was the Real Saint All Along! Volume 2 [EPUB ebook] 

Promised in political marriage to a foreign prince, the soon-to-be Princess Carolina Sanchez has finally made it past her tumultuous debut in Malcosias. After her fairy-tale wedding, a romantic summer escape to the domain of Count Kissinger provides a much-needed respite for the new Prince and Princess of Malcosias. But as Carolina settles into her new life, a magical revelation upends everything she believed about herself. Suddenly identified as a font of holy power, she is now seen as the key to resolving the Malcosian succession crisis. Her miraculous healing abilities bring hope to the royal family, but also usher in unforeseen turmoil. How will the discovery of her new powers affect her relationships with Prince Gilbert, Prince Edward, and even with her homeland, the Kingdom of Celestia?