A CEO does not implement or even necessarily strategize. They... execute. Their job is to make the right decisions at the right time. The decisions available come from a team which a good CEO should trust and not have to micromanage.

I would not expect her to choose the performance indicators. I would expect her to choose another plan if expectations are not being met, but not necessarily come up with those plans.

It's a business, so the goal is making money. YouTube certainly made money when she was calling the shots. We'll see what happens.