After Daphne patched things up with Atticus, she took the chance to also further explain the issue regarding the kelpie. Atticus had decided, then and there, that they had to leave for Vramid as soon as possible.
Raxuvia simply wasn't safe for Daphne anymore; it was bad enough that Jean Nott was still on the loose, having a dark creature lurking around the palace undetected was the last straw! Atticus was confident in his ability to protect Daphne, but he would feel more reassured once they were back in Vramid, where he had complete control over what went on in the land.
If the kelpie dared to follow them to Vramid, it would soon learn what a terrible mistake it made.
Daphne was initially reluctant to leave, but she soon realized the wisdom of Atticus's words. In addition, she knew that Atticus couldn't leave his kingdom unattended for much longer.
Check out the prequel: The Hidden King's Stolen Wife