Breaking Free by Lauraine Snelling

Maggie Roberts is starting over again after her reckless driving led to a 10-year prison sentence and the devastating loss of her son. Having learned to repurpose retired thoroughbred racehorses through an inmate training program, Maggie finds a way to rebuild her life. But it's not until she meets single father Gil Winters and his wheelchair-bound son, Edward, that she finds her calling. In helping Edward with his therapy using horses, Maggie begins to come to life again. But when a shadow from the past returns, she is forced to choose between her newfound freedom and getting Edward the life-saving help he needs.