Please help me help my daughter

My daughter says she can no longer live with her chronic back pain and is not needed by anyone anymore including her 12 year old son.  She is on MS Contin 30mg every six hours and oral morphine 15 mg every 6 hours for break through pain, plus up to 12 methadone 10mg daily.  She cannot function well and cannot do a lot without causing severe pain that affects her breathing and she then has to go on oxygen.  Her pain pump became infected and they had to remove it in October-I have been doing wet to dry treatments to heal the wound, we don't know if the doctor will be able to implant another pain pump because this is a workman's comp claim.  I don't know how to help her get through this.  Please help me-I am so afraid with all she is taking-she could easily take too much. She cried  all day Christmas.   I just don't know what to do anymore.  Please help!!