It probably won't make any difference. My mother-in-law died last Oct. from cancer. The doctors told her, her children told her and she didn't want to hear it, just tuned them out. When they took her to a hospice it started to finally sink in and she started to accept it. By that time she was on so much pain medication she really wasn't aware most of the time. Sitting deathwatch was the hardest part, because you will be torn between wanting to be there at the end and hoping it happens when your away. I hate to put it this way but if it is going to happen pray that it goes quick for her sake so she doesn't suffer needlessly. Try to keep it calm with your family, if she thinks there is trouble she may try to fight and hang on longer than necessary.