I feel for you Rowdy, its not a fun process. My father in law is suffering. If you can get your Mom to go to the Doc there are some new drugs that can slow it down. So time is of the essence.
Our first clue was a car crash, going the wrong way on a divided highway, which sent him to the hospital and he was diagnosed there. He was a heavy drinker so it was hard to tell what was really going on until then. He had been getting more and more forgetful over time. Usually symtoms are worse later in the day, so if you can spend some time in the morning and then in the evening on the same day you might be able to see how bad it is. Good luck, stay calm, S.