I'm sorry about your mom... And the path all this has taken. The advice given to you is invaluable. No one can tell you - not even the drs. How much time it will take, or what your mother's journey will be, but definitely get a hospice involved to make it easier for her and you. I understand your father's denial they've been together a long time and the prospect of losing your mom must be devastating. Enjoy whatever time you can with your more, and father. (it will help him to have you there) hugs and blessings to you all.