Brought down by her husband's sexual behaivor:
The strokes are not the whole story. What is causing the clots that cause the strokes? Most likely based on all her symptoms it seems like she may have neurosyphilis. The reason why some doctors are making this diagnosis is her sexual history that rivals her husband's, the fact that Syphilis is bacterial infection and that it affects the brain and is probably causing the clots that are in turn causing the strokes. Her mental state is also a byproduct of Syphilis that was left untreated and then went on to become Neuorsyphilis. This makes more sense than Parkinson's.