Has she ever had sleeping medication? And if so, how did that work in the past? I'm thinking it might help relieve some of the tension with her current situation.
I've also been considering how all of this might relate to a paranormal situation. Considering the tension, health issues, lack of sleep, etc, could leave her open for attack. So in my opinion we need to at least consider that possibility. That's why I'm thinking a week away might help with this puzzle. And considering the fact that a figure was witnessed at the time that the harsh aggression intensified adds to the paranormal angle. So let's not take a paranormal episode off the table yet.
We have tried every sleep aid under the sun. NOTHING seems to work. We finally started her on Ambien after everything less extreme failed and she was awake for 9 straight days. So now, instead of giving her any medication that may make her worse, we only have her on melatonin... which clearly isn't doing anything either. Which is actually kind of funny, because she always, ALWAYS used sleeping pills in the past and they worked like a charm.
As far as her staying with someone else - I know it sounds terrible, but I don't think anyone would be willing to take her in for even a short period of time. Even her own sister only comes to see her maybe twice a year. It is extremely emotionally and mentally exhausting dealing with her. Since I am here from 10pm-11am I am paid for it because not only can I not sleep while I'm here, but I need the rest of the day to decompress and recenter myself after being here, so I couldn't possible focus my attention on a job. So I can understand how it would be too much for someone to take her in for a week.