(Portland, OR)  --  A Gresham woman who's accused of killing her 17-year-old son is considered unfit to assist in her own defense at trial.  A judge made that determination yesterday regarding 42-year-old Dianne Davidoff, who's facing a murder charge in the shooting death of Jacob Davidoff late last month.  Dianne Davidoff has been sent to the Oregon State Hospital for a psychiatric evaluation.  A status check is scheduled for December 9th.