Daiseijo wa Ten ni Mesarete, Panya no Musume ni Narimashita.

Ally, a great saint with the rare power of prayer. One day, someone tries to poison her during tea time. Then, she decided to pretend she was dead and become a baker, which she had always wanted to be! She secretly changes her job and becomes an apprentice, hiding her true identity, only to find out that the baker's son is her former guard! Furthermore, the crown prince, who is her former fiancé, sends his aide to visit them and he ends up asking Ally to infiltrate the Great Temple to investigate the Great Saint's poisoner...! Unwittingly, the former Great Saintess continues to demonstrate her abilities... (Source: Kadokawa, translated)