hello my grandmother is diagnosed with cognitive impairment and neurodegenerative disease.... how long of a life span does it sound like she has left she also has dementia and went from walking and talking one day had a fall hit her head hard they put two staples in but had to pick out fragments of her skull before stapling the wound she also has a vp shunt because of hydrocephalus put in two yrs ago but as I was saying before the fall she was doing well enough cleaning and talking but like I was saying after the fall she had about two weeks later she all the sudden could walk or stand has and cant speak a sentence some days she not she who we are until we tell her now these are her new diagnosis how much time do I have left with her and how did this happen the fall possibly