There are usually some very deep things going on in their life that has caused them to get to this point.....& there is nothing you can do to fix it. As others have said....be there to listen that is the most important....& if there is a real danger then action to keep her safe at the moment is about all you can do. The professionals are the only ones who know how to work on the deeper things to help them come to terms with them in order to finally one day they will themselves come to terms with the problems that have caused these things in their life.