My grandmother is dying.....?

My grandmother had a Anoxic Brain Injury after being in the hospital with Pneumonia and she is also in the end stage of COPD, she has been taken off her ventilator, she is beginning to swell very badly and the nurse is saying that it seems like her kidneys are starting to fail....I am a CNA but only for a few months now and I know that the end is near I am just not sure what else I should be looking for what I can do to help I know that I honestly cant do much but I guess I am just mainly looking for some guidance on what else to expect in the coming hours or days should she have them.