If you've been married only 4 years and this is wearing on you and she is home only half of each month, I think I would be seriously considering if this is the life you want to live bc she's made it clear to you that this is who she is and what her lifestyle is.
She is not motivated to change.
You have told her you are concerned and she says what alcoholics say. They project blame and protect their addiction.
Do you want to live with her drinking as she does? If not, then maybe it is time to work on a plan to have her leave or for you to leave.
Im sorry you're in this position. My heart goes out to you.