Is it normal for a person who has vascular dementia for 9 yrs to go from walking to being bed-ridden in one week?

My mother in law had vascular dementia and the nusing home told us that at the end of life once a patient became unable to walk to expect death within six months which is in fact what occured

She is 89 and has had vascular dementia as the result of a stroke for 9 years now.

Mom has ALZ and I only acknowledged the dementia/alz a couple years ago. It could be normal progression as it does affect the brain, and all that stuff. Brother has an early form of ALZ/ rare brain disorder, so his body tremors from time to time. My older brother tells me it will start affecting his non voluntary muscles, heart, etc....How old is your mom?

Unfortunately yes, just like the car engine that gives out, the transmission that slips, the brakes that fail. The body is a machine with mechanical limits. The main pump just wears out.