Alcoholic daughter

My first born daughter is an alcoholic she has went from being a beautiful young woman to a person I no longer know,we had 3 years of no contact until one day her ex and kids dad phoned to say she was in icu on life support because she had overdosed on prescription drugs and it didn't look like she'd survive the night,  I just collapsed i just felt my legs fall and my youngest daughter keeping me up,she did eventually get better and we started speaking again and tried to support her but then the lies started again the talk of men etc the smell of alcohol,this had not changed her it wasn't the shock everyone said would change her life...