Going Undercover as the Villain's Nanny

When the author of a romantic fantasy novel wakes up in her own story, she's mortified to find out that she's just a side character who eventually gets killed off! Determined to escape the outcome she wrote herself into, she decides to adopt a new identity. Now, as Bella, she not only escapes becoming the emperor's concubine who's eventually executed, but she also becomes the nanny of her novel's final villain, Eren Winthrop. Can she set right the terrible ending she created in the first place?