Sure its difficult to listen to her blame the president for things that are not in his control and yell and scream. Airing this video accomplished nothing other than ratcheting up the emotion and vitriol that much more. That isn't helping anything.
She's grieving. She is a survivor. She has direct experience of this horror. It was hard to watch for sure, but anger and grief that fuel change are surely better than the usual platitudes. And some, if not all, of the systemic failures she highlights are within the control of the President, and certainly of legislators broadly considered.