There's your blood clot source. It's the dementia she has...
affected individuals may have difficulty with speech (dysarthria), swallowing (dysphagia), and urinary bladder control (incontinence). Some patients exhibit abnormalities that are similar to those seen in Parkinson disease, such as slowness, poor balance and short, shuffling steps (parkinsonism).
And there's the chronic coughing fits.
Closest diagnosis to her visible symptoms yet. Thanks for posting.
When I Googled the listed "Subcortical Vascular Dementia" one of the sources which came up was
http://www.stacommunications.com/customcomm/back-issue_pages/ad_review/adpdfs/2009/september2009/04.pdf
which included the quote:
Clinical SIVD features include sudden hemiparesis, dementia, dy- sarthria, pseudobulbar palsy, and changes in affect including inap- propriate laughing or crying, small-stepped gait, and urinary incontinence. Aphasia and hemianopsia are usually absent. The dis- tribution of lacunes in the subcortical gray matter and diffuse softening of the white matter, particularly of the frontal lobes, have been noted. Behavioral symptoms include lack of volition and akinetic mutism, which were thought to be characteristic of prefrontal lobe lesions.3
But a bit later:
Binswanger’s syndrome was first described by Otto Binswanger.7 [...] The clinical features of Binswanger’s include an insidiously progressive dementia, persistent hypertension or systemic vascular disease, lengthy clinical course with long plateaus, and the accumulation of focal neurologic signs including asymmetric weakness, pyramidal signs, pseudo bulbar palsy, and gait disturbances. The neurobehavioral symptoms include apathy, lack of drive, depression, and alterations of mood.
I think you nailed it.