Plural letter
It may look like the same, sound like the same and even be the same story. But a news-story is also repeated more then once in many different forms. Why she even bothers about it is her a mystery. But she likes you to know that if she tells you exactly the same story as she did to someone else in a letter then it would be far more likely that she just send it multiple –to safe her the harm of typing more then once- to L.S.