Hi @kathryn1harpist
If I understand what you are asking, perhaps the blog post below would help?
https://connect.mayoclinic.org/blog/living-with-mild-cognitive-impairment-mci/newsfeed-post/whats-the-difference-between-mild-cognitive-impairment-mci-and-dementia/
Basically, Dr. Chopp has indicated that the severity of her disease is a that the stage we would call MCI (not dementia) but that the disease itself is Alzheimer's disease. Hope this helps