I am saddened to hear that brother, just remember if she does go that she will be in a better place. It's tragic to watch things like this unfold before our very eyes to our own blood and have no power to do anything, so just know this that we are all banding our energy together to do all that we can along with the doctors.
I watched my uncle wither away rapidly over a 6 month period when the lung cancer went wild on him, there was nothing we could do but give him more morphene. He is up there now waiting for the rest of us to see him again some day.