Bookworm girl died buried under her beloved books during an earthquake and awoke in a medieval world (no magic mentioned till ch12.5) in a 5 years girl body. Here paper and books are rare and expensive, as a poor family kid, she decided to find a way to create her own books.
Interesting but Mc is so obsessed by books that she sometimes acts too immature. As a 5years old its fine, but as an adult spirit it's kind of ticking me.
Ascendance of a Bookworm