I'm so sorry to read about this downturn in her health. My sincere sympathy. You are a great caretaker and I'm glad to see that you have help from hospice. I know how good they can be to help ease the situation.
My oldest sister has been gone now more (from dementia then eventually stomach cancer) more than 2 yrs. Amazingly she kept her sense of humor and some level of awareness 'til about the last week. I hope that medical research helps to give some better quality of life to sufferers really soon.
Hope your keeping well, too. Hugs to you both.