I’m sorry to hear about this, but if she has abused her body as you say she has, health issues are inevitable. My step-grandma‘s family had a history of long life, but she drank and smoke herself to death by 72. No amount of prayers can help a lost cause.
Will hope for the best. Also pray for the health care workers taking care of her. People coming off alcohol and other substances are difficult to take care of and frequently abusive. I've taken care of many, its exhausting.
I hope for the best for her. She may be an entirely different person , if she sticks with it.