I am the durable and HC POA for an elderly lady that still lives on her own, but shouldn't be. How much would be a fair amount to charge her?

My client has very advanced dementia and periodic manic behaviors. Once, the other companion care provider found her having kicked a hole in her bedroom wall and was stabbing the wall around it with scissors. She found that the lady had gone through the house and cut the cords to all chargers and clocks with scissors when they were still plugged in! She has violent tendencies, and we replace the remote controls for her TV sometimes 3 times a week because she destroys them. She has literally busted 3 computer screens (she used it to play solitaire) because she lost at solitaire and threw a stapler or whatever else was nearby into the screen and shattered it. She did the same thing to a brand new 60 inch TV by throwing a remote at it.

She has resources and assets, but refuses to even visit care facilities. She also threatens to kill others and herself frequently when she's having one of her manic meltdowns. I do nothing but pay her bills and handle her legal affairs but she always makes up in her head that I'm stealing from her. I have been doing this for free, but frankly, the time consumed away from my work in my businesses is making that impossible, so I will have to start paying myself for the hours lost in my work. I'm thinking of a figure something like $36,000 per year, simply because I spend so many hours at her house or on the phone with her solving problems she's made up in her head. She routinely tries to close her bank accounts, and until I got the bank folks on board, they would let her, destroying the hours and hours of work it took to set up her bill pay accounts online. She hates everything on the computer, so if she finds out I have online access to anything (which is basically the only way I can find out how much she owes on the accounts I pay the bills for), she will figure out how to call and restrict this access. Even though my POA is on record with all her vendors, they will usually respect her wishes leaving me dead in the water. Most recently she opened a new bank account at a different bank than she banks with, just to take advantage of a higher interest rate but as soon as she got the welcome letter in the mail, went to a strange branch and filed a fraud claim accusing me of having set up an account without her knowledge or authorization (which I technically COULD do, but have never). Once the branch where she set up the account and funded it told the fraud department that she had set up the account herself, they resolved, it, but some idiot in the fraud department called her to tell her the issue was resolved, and she again told them she hadn't set up an account at their bank and reopened it. I've spent some 40 hours so far trying to work with them to recover her funds from a suspense account!'

So, my question is this: How much would be a fair amount to charge her for the hours I spend dealing with problems she causes due to her illness (and a mean streak she had well before dementia set in), and how can I effect getting paid when she won't remember she allowed me to do this?

Thanks for any ideas. I'm about at the end of my rope. She's threatened to kill me over "stealing her money" which I clearly haven't done and can document, and threatened to kill her attorney because he won't let her cancel her POA. But my business, my income and my family is suffering as a result of the time I spend, and I can no longer afford to help for free. She has no living family members, and has run all the rest of her friends off by accusing them of various issues they also haven't done. She has alienated herself from her neighbors by calling the police and sherriff on them for things that aren't a problem, such that I believe if she fell in her yard and was dying, none of them would even bother to pick up the phone to call an ambulance. Any time we bring up looking into facilities, she has a meltdown and does even crazier things. How do I get help to put her someplace to protect her from herself?