Winnie the Horse Gentler
This series by Dandi Daley Mackall is about a girl who has lost her mother and wants to become a famous horse gentler.
Wild Thing (from Amazon):
Twelve-year-old Winnie Willis has a way with horses. She can gentle the wildest mare, but other parts of her life don't always come as easily. Along with her dad and sister, Lizzy, Winnie is learning how to live without her mom, who was also a natural horse gentler. As Winnie teaches her horses about unconditional love and blind trust, God shows Winnie that he can be trusted too. Readers will be hooked on the series' vivid characters, whose quirky personalities fill Winnie's life with friendship and adventure.
In #1 Wild Thing, Winnie's fearful heart finally begins to trust God again as she tries to gentle the horse of her dreams, Wild Thing.
From the Back Cover
I have to have that horse. And I'll do whatever it takes to get her. Twelve-year-old Winnie Willis loves horses just like her mother did. But since her mom died two years ago, Winnie, her sister, Lizzy, and her father have moved five times. Winnie never cared much until now. She has a chance to buy the horse of her dreams at an upcoming auction but how will she ever earn enough money? More importantly, how can she possibly convince her dad not to move them to another town... again?