Excuses or not, now is the time to help your daughter to learn to become reliant on people other than you. Perhaps this is why you posted here? You're carrying around an unnecessarily enormous burden. With or without alcohol, you won't be around to care for her forever, and you may fall ill or become injured due to your drinking or as a result of the natural course of things in life. Add to this that your daughter is going to need to grow into being with other people at some time in her life, and the sooner the better. The existing pattern only gets increasingly difficult to change as she grows older. Her relying on you exclusively -- and you're at least suggesting this in your comments -- is not healthy for either of you.
What better reason to help your daughter become less reliant on you and more independent (even if she's just taking baby steps at first) than for you to get sober and start to heal?
Now is the time.