Jami......I also hope you are not taking on this responsibility by yourself! If so, such a task! My Mom has been many years in a wonderful Alzhiemer's facility and is in the last stage also. The caretakers are absolutely wonderful and very appreciated.
Several things you mentioned are very similiar. I often have to remind Mom to swallow...she simply does not remember that bodily function. Sometimes she will just keep chewing the food, or hold liquid in her mouth not knowing what to do with it. This is just part of this horrendous disease.
When you mentioned "conversations"...it reminded me of the first time this happened with my own Mother. She kept calling me "Maxine"...the name of her only sibling who had died the year before. I gently told her Aunt Maxine had died....Mom said..."Well, she's standing right behind you!" Several times I have thought she is talking to someone....and who actually knows....maybe she IS seeing someone! I have come to accept this in my mind as a gentle pathway for my Mother in the closing of her life...with persons she knows helping this transformation. Again.....who actually knows?!?
I lost 4 babies....3 miscarriages and one full term son. Once in a while Mom looks above me and says in perfect words..."Look at all the babies!" Her speech is usually garbled and rhyming syllables and when recognizable words come forth it always takes me by surprise.
Those of us who share in your heartache surely understand your challenges...and concerns. Please know my thoughts and prayers go each night for everyone dealing with this disease. Sending positive vibes your way.....Pam