Emeline Sahw watched as her daughter die a very slow painful death because of the Quarantine.
Her daughter, during her final moments, died calling out for Emeline but due to her advanced green poison condition, she was unaware that Emeline was taken far away from her side. Emeline final moments with her daughter was seeing her daughter cry in pain and asking where she was as her daughter's sight became dark and her ability to hear her mother voice could no longer be heard.
The death of her daughter is what drove Emeline Shaw to become what she is now in Division 2.
Emeline was offered a chance to commit suicide by another Outcast to end her pain but she would not take it and stated she will not stop killing people because she can not stop seeing her daughter die the slow painful sorrowful death over and over again every single day.