At what point do you decide to actually cut off a member of your immediate family?

One of my family members is an alcoholic and I'm the only one in the family who acknowledges it. At this point, it can't just be ignored because she is demanding things from me that will drag me down with her. I don't drink or do drugs and am trying to finish my education so I can be completely self-sufficient. I have to figure out what to do for my own good no matter how much I love her. Suggestions on how to go about it?

At what point do you decide to actually cut off a member of your immediate family?
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