Someone would have to be purposely/recklessly lied about for it to be a libel. They will run a correction and that will be the end of it.
It would be an expensive case to litigate, and I'm not sure it's worth the $$, but I bet you ANYTHING that if you could subpoena her (the authoress, not the lying "victim") tweets, her Facebook page, and whatever else she's created by way of social media that it would be VERY easy to prove malice.