Suicide attempts or threats are the ultimate manipulation. The individual is using his or her own life as a means of controlling a situation or a person. It's sad and very hard to "ignore".
I'm glad your AW isn't home right now to further toxify your home environment. Are you or your children in any kind of counselling (or Al-Anon/Al-Ateen)? You really could use some support to get through this.
This is the perfect time to focus on yourself and remember that as much as you have NO CONTROL whatsoever over her addiction, you also have no control over her life or her death. Let her deal with her recovery and focus on your family. Perhaps start to think about what your boundaries are....what are you willing to live with at this point? What aren't you willing to live with? What are your goals? How do you plan on getting there?
I'm glad you found SR. Please keep posting and reading as much as you like. SR is always open.