Darkeyes,
I'm so sorry you're dealing with a parent with dementia. It's heartbreaking. It's good, though, that the doc has identifed it as vascular, because that helps guide treatment and management intervetions. Vascular dementia often progresses in a step-wise manner, with declines followed by plateaus and then decline again and so on. Whereas Alzheimers is a more gradual and continuous progression. With vascular, I believe the most effective approaches for slowing the decline are health-related. Anything that can be done to manage her blood pressure, diabetes, etc. will decrease the likelihood of additional bleeds leading to damage leading to another decline. And with each new decline, working to compensate and adapt to the current status is key. Difficult, but key.

There's still so much we don't know about dementias. And the pain and stress is there, at least in the background, pretty much all the time.

I hope you're able to find time for your own self-care. That's another key.

My heart goes out to you and your family.

gg