It's only a start. She's preparing the people to be more hostile toward Russia with conspiracy theories such as this. It's not about the hacking; it's the more severe accusation of influencing the election and American politics. The FBI is already starting an investigation. She also wants a no-fly zone over Syria in direct confrontation with Russia, escalating the tensions. I can only see more hostility in the future.
That the US would go to war over the hacking of a non-governmental institution is ridiculous, and whoever is spouting stuff like that should immediately lose quite a bit of credibility with whoever is listening. Only congress can officially start a war, and if the president started getting aggressive with a country such as powerful as Russa over something so small, well, there would be some interesting ramifications to presidential power. Remember, congress has the ability to amend the constitution.