Among other problems, my sister was in a car accident 2 years ago and had a concussion, and her mental health has declined since then. In what could possibly be ptsd, bipolar disorder, or borderline (suggested by doctors), she goes through periods of what sounds exactly like psychosis. She also pushes the rest of my family away and isolates herself, thinking she has no problem, and my family only wants to help her. She speaks to me more than them. We don’t know how to help her without completely pushing her away or putting her in harm. 

I realize this won’t be the best place for this question. But any thoughts as to how we should help her, especially without pushing her away, when she doesn’t see that she has a problem? If you’ve experienced any of this personally, what help could have been/was effective for you?