don’t treat her like a child or resort to marking bottles etc, remove ALL the booze from the house. You need her to have a DRY environment at home.
Try to offer her as much support as you can, listen to her, she’ll be going through hell and she needs your help to see a way out.
Tell her how much she means to you, tell her why you love her, help her see a better future rather than “confronting a problem”.
Always try to push the positive, don’t talk about the negative. Addicts don’t care about the negative consequences, they need the promise of a better feeling than the one they are getting from the drug to escape their addictive behaviour.
I caught this on TV the other day, it might help: http://www.bbc.co.uk/iplayer/episode/p00wq21g/Russell_Brand_From_Addiction_to_Recovery/