Confused & Delirious Terminally Ill Person Keeps Leaving Hospital Against Medical Advice, Among Other Concerning Things

My location: New York State, USA
My mom (59) has end stage liver disease and has been in and out of the hospital very often the last 3-4 months, but about 2 weeks ago things took a sharp turn for the worst when she seemingly had some kind of mental break and decided that she’d be moving to Florida (to live with her mom) in ~10 days, (which would now be May 5th) leaving all of her things and her 3 cats behind for her boyfriend and I to figure out what to do with, which were both not at all okay with.
This last week she has gone to the hospital 3 different times and has left against medical advice each time. She somehow has passed a psych evaluation as well, despite her doctor telling me during one of these visits that he thinks she doesn’t understand what’s going on at all or the gravity of her decisions and despite not being med compliant. She refuses to take them for the most part or eat a low salt diet which is basically imperative for her to live at this point.
She has barely been able to sleep and I think is also suffering from hepatic encephalopathy, which happens in liver patients when ammonia builds up in their bloodstream. But somehow she passed that psych evaluation, and has been putting on a convincing show to her close friend and mom who have both been helping her. It’s incredibly concerning but essentially she is still capable of manipulation in these cases despite suffering from confusion exacerbated by exhaustion.
She has been telling her mom and friend that her boyfriend is abusive and evil to her (not true at all!) which is another part I am very concerned by since she has such an ability to lie and manipulate still. It’s so strange to witness, I have no idea how she’s doing it.
So my main questions are;
is there anything I can do to get her to stay in the hospital long enough to actually get treatment and not just regress immediately when she gets home?
is there anything I can do legally to help protect myself but especially her boyfriend if she tells more concerning lies?
Thanks in advance, there’s a lot of nonsense to all this so I may have forgotten certain details so please ask any questions if you want.
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