For one, your memory is just all over the place. You wouldn't be able to hold it together long enough to read from a teleprompter.
Think about if you ever had anyone close to you live with the disease. It gets worse day after day, its random when/if they have moments of clarity, they need help doing a lot of stuff (depending on how far advanced it is), and its a lot of repetition, talking in circles.
I am officially on the paid actor bandwagon. Something is just ... off about the whole thing
Sigh. A definite learning experience. I always felt blessed that she was so docile because looking around her nursing home and watching my Dad previously, not everyone is as "easy" as she was. She certainly wasn't always an "easy" person when she had her full faculties so there was so much to process as the roles changed.