I would show her what you found, tell her that obviously you are concerned and then ask her what is going on...and then see what she says.
I like DejaVu's suggestion. Beyond expressing concern, listening/validating, and offering support if she wants it.. you can't control how much she chooses to drink or if she got mad at you for bringing it up. [You can control whether you discuss or report this behavior with family, friends, mental, legal, or law enforcement services. You can control whether you talk to her about it in a curious and supportive, or judgmental way.] I'm sorry you're going through this. Look forward to your update when you're ready!
