Try not to overwhelm yourself Memphis. What you are going through is huge. It is good to have a plan but there are so many variables you don't know at this point. I can imagine how painful this must be if this child is yours and she doesn't stop drinking. The risks are great. There are no easy answers in your situation so keep the focus on the present.
One thing I would do is really be honest to yourself about who she is. That is probably the first stiep. It was the step we were trying to point out to you until the change in events. Until you really face that you cannot cure her drinking or control it then you will be better able to make decisions for yourself and your possible unborn child.