Alcoholism Support Group
Alcoholism is the continued consumption of alcoholic beverages, even when it is negatively affecting your health, work, relationships and life. If you think alcohol is causing you to lose control, it's time to seek help. Our group is a safe place to vent, check in, get back up if you fall, and reach sobriety.

Example...
I live with my mom. I'm 34. If I leave the house I tell her where I'm going and approximately how long I'm going to be gone so she doesn't worry. If I'm not back when I say I'm going to be back then in an hour or so she knows something's wrong.
Also thanks for posting because one slip and I could be that guy instead of being there for my kids.
Prayers
In actuality she would probably welcome some rules and order. Just lead with a loose reign ...
I have requested my 17 & 19 year old keep me informed of their plans (location and times) out of common courtesy and respect. While you may not be her parent, it is your home and you have the right to set the boundaries. Her part is to be responsible and follow them. That is not unreasonable. Time for a loving heart to heart chat with her.
Block the dad's number; if he wants to know what's going with her, he can ask her. Neither of you two need that kind of input.
Until the individual is age 18, the parents are obligated to support them unless the court has terminated the obligation somehow.
You are in dangerous territory here. I would seek legal advice. At least call Child Protective Services, or whatever they call it where you are.
Best of luck to you. I hope it works out.
I'd see an attorney in family issues.