Hacking To Hogwarts

As she is preparing for her 4th year at Hogwarts, Krissy's loaner returns her horses saying they can no longer keep them, having over 10 horses her mother cannot ride them all and one of hers has to be exercised regularly because of health problems. Krissy cannot leave her horses at home and she cannot go to Hogwarts and leave them unexercised so she tries to bring them to Hogwarts