When this much has been going on, I'd highly suggest an inpatient rehab program. At 17 you're able to get help for her. It's a great place to be to learn about the disease and to start learning the tools needed for recovery. Look for a rehab that has a good family program. This is nothing to be ashamed of. There are a lot of good people who have this disease. It truly is a physical disease of the brain and requires active recovery with help from those who understand it. The addiction often will fool people into thinking they can quit on their own, and some do for a while but not for good. It is a chronic progressive disease that requires serious help.
Thank you for being here for her. She has to do this for herself, but getting her into treatment is the first step of her gaining some skills to deal with it. After rehab is often harder and needs to have continued counseling.
For you and your family, there's Alanon and Alateen.
http://www.al-anon.alateen.org/local-meetings http://www.al-anon.alateen.org/local-meetings
Individual and family counseling with addiction professionals could be very beneficial to all of you. If she lies to you, try not to take it personally. As my husband's rehab counselor said, and RAH agreed with him, "If an alcoholic is talking, he's lying." That is part of the disease. Thankfully, recovery programs stress personal accountability and honesty. Recovery is much more than getting sober. It's learning how to stay sober and live a better life.