Welcome, and I hope you find some hope here.
And when I say hope, I mean hope for your future, regardless of what she chooses to do or not do. This is your one shot at life. Make it count.
As for her, what she says when you try to confront her is normal alcoholic behavior. It is said that alcohol protects its perimeters. Calling her on it makes her panic. She probably can't imagine a life without drinking right now, much less how to go about quitting. She isn't ready.
In the meantime, ditto to Hammer's suggestion. Try Al-Anon. You may be in for an even longer ride if you choose to stay with her, so best have all the coping skills you can have for it. You'll find them at Al-Anon.
Keep coming back,
~T