What if this is the time that she really does follow through and takes her life? How do I learn to just turn her off? Her disease is killing us, the people that love her more than she can ever know.
She is in charge of her own life..... all the way in charge. I can't control her... and you can't, either.
Txsun is right, next time, call 911 and ask for an ambulance. A ride to the local psych ward (ours is at the local Catholic hospital) might stop threats that might be just "drama" and protect you if she is serious.
You made the right choice... she wants a safety net, but a safety net (in my experience) kept them just south of deciding to get sober. It was actually faster to NOT have the net in place.
You are a loving sister... and so is she, beneath the addiction. I pray she can find her way soon.
((hugs))