I loved the movie Dave, and would not be surprised she is tucked away somewhere on life support. But in reality, I suspect she is faced with an end of life situation, and is faced with months to live.
Lung cancer, at least one type is extremely fast growing and very deadly. My father went through it. They could not perform surgery, so they did chemo and radiation, gave him a clean bill of health only to come back with a tumor in his esophagus months later.