In Keisha's Shadow (PB) (2012)

Dumped by her high school sweetheart for not being out and proud, bi-racial Tori Kahl struggles with college life, her demanding mother, and the legacy of her dead sister, Keisha. Her only escape comes from her horse and her job at the stables. Then Ashley, the brash and flirty new boarder, shows up at the stables and not only challenges Tori's top rider status, but shakes her world of self-pity as she copes with the ups and downs of growing up.