It seems that she would have been indignant when a stranger tells her that her husband is a murderer and you'd think she would want proof. I know I would want proof of such a thing. Also, the woman who was the real killer acted so creepy anyway, you'd think that the girl would have realized that something was wrong and she wouldn't have trusted her. 

I think it would have been a better ending if the husband AND his wife had both trapped the woman in the end and it would have turned out that the wife knew all along and had been in on the plot with her husband. It would have been a trick ending and it would have made more sense. I would have liked the story better that way. It could have been written so that the young wife acted like she believed her husband was a killer, but in the end we find out that she was working with him all along. So in that sense there could have been a story.

Actually, if I were the husband, I would be really hurt that my wife thought I was a murderer and trusted the woman's story. 