A Horse Called Mayonnaise 

From the Back Cover:

Ever since Tory heard about the horseback trip at camp she’d been unable to think of anything else. It was her reason for being there to work and almost her reason for 'being at all.

But now her dream’s in big trouble. Gorgeous Jan Cole has signed up to go and only two girls will be chosen. How can she compete against a girl who always seems to get everything based on her good looks?

Discouraged Tory’s ready to quit till a friend helps her see herself from God’s point of view. When she decides to trust Him with her hopes she’s in for a summer beyond her wildest dreams. A summer that brings the thrill of a horse called Mayonnaise.

Collect all the books in this series and you’ll have all the information you need to complete a horsemanship and horse husbandry honor in Pathfinders (minus the hands-on experience of course!). (For ages 13-16.)