Come What May by Lauren Brooke

Heartland is a horse farm nestled in the hills of Virginia, but it's much more than that. Heartland is like no other place - it's a place where the scars of the past can be healed, a place where frightened and abused horses learn to trust again.

When Amy finds out her sister, Lou, is trying to get in touch with their estranged father, she doesn't know how to feel. She isn't willing to let her father into her life again. Forcing herself to forget about it, Amy focuses her attention on the new horse, Melody. But when complications develop with Melody's unborn foal, it takes nothing short of a miracle to help Amy realize that life is not about the pain you've felt in the past, but the hope you hold for the future.
 
- Goodreads Summary