Well Kath hates her sister in law and felt the need to tell the world. So she tells the world in her blog. I happen to come across this blog article while searching for the origin of an expression that happened to title one of her blog articles, "Great Odins Raven."
So I ask mys, "has she thought her sister in law might find the article." Its very possible her sister in law does not spend much time browsing the internet and therefore will never find it. However, you never know. Perhaps she does secretly wish the article to be discovered and she would never have to talk to her sister in law again.