You are fortunate indeed. My m-i-l was not so sweet at the end.
We think it was mini strokes for her as well.
One of my friends has dementia and he is 55 years old. He hasn’t known anyone for the past 10 years. He is beginning to lose his ability to speak. The last thing he did before being committed was drive away everyone with his anger. By the time everyone figured it out, it was too late.