"All is Calm; All is Bright" by Colleen Coble

This book is two Christian fiction mystery novellas, All is Calm and All is Bright, and although they both belong to other series Coble has written, they stand on their own perfectly well too.  Which is good, because we read this for my church's book club this month, and none of us had read any of her other books before.  But I plan to look for more now!
All is Calm is part of the Lonestar series, which takes place in Texas (obviously).  A woman accused of helping sabotage a race horse runs away ...