Yeah, I had to cut Mom off long before her move... The constant stream of agitated nonsense was corrosive to my mental health. I kept lying awake at night, trying to figure out how to battle the onslaught of total bullshit from Facebook and the far-far-right blogs that her boyfriend kept feeding her... In the end I figured that I couldn't defend against the entire internet and some dickhead who lived with her 24x7x365, so I walked away.
There's only two scenarios I can envision -- I get the call that she's been hospitalized and to come get her, or I somehow find out she's died. I'm not sure how I'll deal with either, but I'll know that she did it to herself by believing the bullshit over her last living relative.