She was just rubbing faces with the Kelpie but it's Riftan's fault for trying to stop her ok.
Like some of these comments
Tf is a kelpie
An spirit that takes the form of a beautiful horse, and lures people in to either riding it or being comfortable around it. Then when they get their guard down it heads to the water and drowns them. I think it's in either Scottish or Irish folklore.
If he didn’t call out to her and distract her it probably wouldn’t have got her they get you when you let your guard down