Schizophrenia

Sister has been displaying signsof schizophreia since a few years.she is constantly invading our privacy by recording or filming us.She hears voices calling her names.She thinks the government is colliding against her.She is under the impression that all family and friends are out to cheat her and are against her.She is very negative fights at every little issue does not go out of the house at times for a year.she has on several instances assaulted and beaten up the courier boys in our building.By and large the people are very frightened and vary of dealing with her. I have recognised this as schizophrenia and know she will not come to a doctor for help as she is convinced she is ok and that there is something wrong with everyone else. What are the correct steps to take to ensure she gets the right help and care. Starting with a medical report to put on record that she is suffering from this disease. On the legal front i am tied in with her on two properties where we both a joint 50 50 owners.given her condition she makes the process of selling virtually impossible due to her bad behaviour and suspicious nature. I want to know the procesd to get her tested certified and then help can be given to het.I would also prefer if someone else like my mum was appointed as a trustee of her share so she does not squander or misuse her share.