She's the perfect spokesman because she is guilty of the same thing. She is showing the Republicans that the MSM can slap them around whenever they like.
You will notice that social media decide to crack down on "dissent" after Trump was elected. Social media has too much influence on societal narratives. The MSM has lost much of its control over the narratives it pushes.
So when Rice says Trump twists the truth and Trump supporters point to Rice twisting the truth about Benghazi, that dissent becomes "fake news". "Fake news" is news that comes from sources outside the mainstream. That's what social media wants to eliminate.