For this time, Elizabeth will keep that second book a secret, and she intends to spend any free time reading from it to learn about monsters and any history from which she can learn. She's curious about the spells, but will not attempt to replicate anything at this point. Eventually, she'd like to see what the potentials are to see if she wants to learn any of them.
She'll look into the Romanian one later, but she doesn't just want some random person in town reading this book.
If she's able, she'd like to rest five days, reading, to regain some Humanity.