Well, presumably it just comes down to (without wanting to sound too Primary school) who started it.
You'll have to explain why Laura Murray felt the need to leap in, unprompted to something that didn't relate to her and (allegedly) libel someone.
To be honest, everyone involved strikes me as just needing a good clip round the ear, but I don't think there would have been lawyers involved anywhere if some angry people hadn't decided they wanted to be a bunch of dicks to somebody on the internet.