My ex was an alcoholic. Even when she said she quit, she would get drunk when I wasn’t there. Then she lied about it. I would find half empty vodka bottles in her freezer and she would make some BS up. Then she lied some more. Pretty soon I didn’t know what to believe and couldn’t trust her. You’re also not a trained psychologist who can help her. You will try though and get frustrated. This is the path you will end up walking.