Isekai _ Into animals/objects

Fl is transferred into a novel she only read 3 pages of. She is “reborn” into a cat that is something like a holy beast. She ends up being able to shapeshift.

Cat is like newborn at the start. And when fl is able to shift by mistake the cat is around 1 year old, but female lead is able to be a young adult is human form.
Kinda weird but also makes sense since lifespan is not the same between a human and a cat, and the story wouldn’t really work if the age was the same.

Kinda w