At Midnight

If you read this & know the book please tell me. 
          	
          	There's this girl named Aria (I think) it's back in the old English days. She lives in a cottage with her family. There's a creature involved that she visits in a forests. She meets a guy on a horse I think. They would always meet there for a while and then she would have to go back to do her chores. 
          	
          	I honestly need to find this book so I can read it. Helppppp