Spalding, I saw my second husband go through liver shutdown and he was exactly like an Alzheimer's patient. He said things that made no sense. He talked about getting well and building a boat. I remember going to the Barnes & Noble and picking up a copy of this magazine called "Wooden Boat" that he was thrilled with. Just try to play along with her, distract her where you can, and yes, call in the pros when you need to.
Hugs, you're a very wonderful daughter, one I'd be proud to have.