His Convenient Mail Order Bride by Ruth Ann Nordin
When Phoebe Durbin answers a mail-order bride ad, she doesn't realize the groom-to-be didn't post it. Worse, the day she arrives at her destination, she learns he doesn't even want to get married. Having nowhere else to go, she convinces him to give her a chance to prove having a woman cook and clean for him will be the best thing that ever happened to him.
Abe Thomas reluctantly agrees to take Phoebe in, though he doubts they will make a good match. They're much too different. While she sees the best in things, he knows the world is much darker than she can ever imagine. No woman in her right mind would be his convenient wife. He's sure when the stagecoach comes back to town, she'll be the first one on it. After all, two people so completely different can't make a good match, can they?