Katie Price's Perfect Ponies: Ponies to the Rescue: Book 6

Jess, Mel, Sam, Amber and Cara are lucky enough to be able to spend as much time as they can with their ponies at Vicki’s Riding School. Tragedy strikes when Dumpling, the oldest pony in the stables, dies. Darcy and her friends want to cheer Vicki up and help her raise the money for a new pony, so they decide to go carol singing on Christmas Eve.