I'm not telling you to leave or stay. But I am telling you that every time you ask her a question about her drinking she will lie. She can't tell the truth. She can't. Save yourself the grief and don't ask questions you already know the answers to. It's a waste, and she will resent you for asking and you'll resent her for lying.
Soon, if not already, she'll start lying even when she doesn't have to. The lies will not stop until she believes in her heart she's an alcoholic, and also seeks recovery. And that may never happen. Even if it does it will be a long, long time before she learns how to tell the truth again.
Also, conversations and heart to hearts don't work. Alcoholism doesn't care. The only thing that works is deciding what your boundaries are, communicating them to her and enforcing them, not enabling her, and not protecting her from the consequences of her drinking.
That's it. My two cents. Take what you want and leave the rest.
Cyranoak