There's always a chance, but you can't hang onto that hope. You need to take care of yourself. If she does return, it will take a very long time (maybe even years). If you keep the hope, it will drive you crazy and hold you back. Let go, move on, and let things play out.
M:39 W:37 Together: 16 years Married: 11 years Bomb: May '09 (ILYBNILWY) Moved out: Nov '09 D: 10, 8, 4