Rosemary Nelson 
Dragon in the Clouds [PDF ebook] 

The Okanagan summer stretches out in front of twelve-year-old Nikki like a sparkling rainbow, with lots of time to spend at the beach and with her horse, Ginger. When her cousin Trevor arrives in his wheelchair, spoiling all her plans, they take an instant dislike to one another. But a vision in the clouds will change both her and Trevor’s feelings about a lot of things and, in fact, will help make a dream come true as Trevor competes in the B.C. Games for the Physically Disabled.