Ascendance of a Bookworm (Manga)
j-novel.club
Manga by Miya Kazuki, Suzuka, Ryo Namino | A young woman who loves books dies and is reborn in another world as Myne, a sickly child from a poor family. Worst of all, there are almost no books in this world! So Myne decides that she'll just have to make her own and become a librarian.

The High Priest deems Myne free of any malice, but other threats lurk in the shadows. The head of the Ink Guild expresses a worrying interest in the lower city’s resident bookworm, and a sudden encounter forces her to isolate in the temple early.