Dear 101~
Welcome here to the Forum, I'm very sorry to hear of your situation, it sounds horrible, upsetting and frustrating.
It looks from what you say there really are two problems, your mother getting appropriate treatment, and the other being trying to stop her from intruding on you and your family.
I'm assuming from your words that you and your mother live at different places. If I've made a mistake there please sing out.
Does you mother live with anyone? Or is there anyone in her life she might take notice of and perhaps be persuaded to leave you alone and maybe even get treatment?
Under normal circumstances for anyone to receive effective treatment they have to make the moves and get it themselves, and want it to work. If your mother does not accept this there is very little you can do. I'm not familiar with practical matters however I'd imagine for treatment to be administered without her consent in a hospital or elsewhere would be a matter for medical professionals and, depending on the circumstances, the police.
A good starting point in any event might be talking to your own GP for advice.
As far as getting her to leave you all alone, this too is a difficult matter and I guess you can go down the path of a restraint order (name varies in different states). Again I'd suggest getting advice. Most states have an government advisory bureau dealing with the obtaining and implications of orders. As you have already had some dealings with the police it may be that they can give advice too.
All this is highly worrying and stressful for you. Do you have to face it all alone or do you have people with you to support you - maybe a partner or your own family? Such support is gold at times like this.
OK, I've said a little based on what you have said so far, I'd really like it if you came back and said what you thought.
Croix
