Hello, I am in need of adults who know a lot about the law and such.

I have a grandmother, who has been suffering Schitzofrenia (or something else, we aren't sure) and we need a way to help. For those who aren't aware, the disease makes you think you are being watched, having your mind read and followed. My grandmother has it extremely bad, after todays visit she claims that she is unable to even use the bathroom in her tiny apartement, cause she belives the other inhabitants watch her (her bathroom does not have windows). Previously she has also threatened to beat my sister cause she thought she was a druggie, yelled at teenagers outside her aparment cause she belived they were following her and nowadays refuses to leave her tiny aparment, saying that she will not not "dance along with the others". 

Her case is very bad and we want to let doctors examine and help her. She is living in constant fear, but because if the law, we cannot force her to go, unless she becomes a threat to herself or others. She herself obviously belives that this is all real, and thinks that if we were to send her to the doctors, they will drug her and her apartement will be robbed. We dont know what to do, but I'm hoping that someone here has had a similar experience and knows a way to bend/trick the system.
I am thankful for any suggestions and i can provide more info if needed. Thank you all.