She uses green screen a lot to add all the graphics behind and to the sides, which often makes the edge of the person a little random (pixels blink on and off),

She uses green screen a lot to add all the graphics behind and to the sides, which often makes the edge of the person a little random (pixels blink on and off), and the shadows in the graphics may not fall in the same direction as the shadows created by the light on her. In a similar way weather on the news makes the weather person look a bit surreal.