Gyakkou Shita Akuyaku Reijou wa, Naze ka Maryoku wo Ushinatta no de Shinsou no Reijou ni Narimasu - Seijou Anna no Monogatari

Although born to a small, noble family in the countryside, Anna, the daughter of a baron, ends up attending the country's most prestigious school, the Trusova Magic Academy, at the request of her kind parents. She nearly loses her place in the school, which is a microcosm of the hierarchical society of the nobles, but her fate changes dramatically when she meets the graceful and beautiful young lady Rachel.
Another story of time travel told from the perspective of Anna, who eventually becomes a "saint."
https://www.cmoa.jp/title/315465/