Dallas & the Cowboy by Linda Goodnight

He just had to add the sheriff part. Show off his authority. Typical cop.
But the memory of strong arms and a warm chest came back to her. Comforting, secure. He’d taken care of her.
She can’t find her footing…
Dallas Langley is still coping with tragedy when she receives a mysterious phone call that leads her to Calypso County, looking for answers about the father she never knew. When the local sheriff rides to her rescue, she can’t help the intense attraction that flares between them.
He’s not looking for love…
The last thing Sheriff Lawson Hawk needs is another complication in his life. The life of a lawman is already difficult. When his thirteen-year-old niece shows up on his doorstep and needs a place to stay, he can’t say no. And when the beautiful stranger in town catches his attention, she makes him reconsider his stance on being a bachelor forever.
With the sheriff by her side, Dallas can face the truth of her past. But is she strong enough to overcome the tragedy that still haunts her?