St Patrick's Horse

When horse mad moy hears about the curse she can't believe it. A magic horse tried to kill St Patrick hundreds of years ago and was banished to live in a dark lake forever. Moy swears she'll find a way to set him free.
Meeting the horse is the easy part. Discovering a way to break the curse is much harder. Now Moy's best friend won't talk to her anymore and her mother thinks she's going mad.
All this just because moy loves horses!