Due to completely unrelated medical reasons, now is not the time to have the talk. It has also been a couple of weeks since the last incident and I would rather have the talk when an incident (or consequences thereof) are fresh in her mind. I will probably wait until after the next incident when her head is clear. This may take a while. The last family incident really made her tone it down. If she brings it up sooner, I may take a shot at it then.
I also plan to start by discussing the behaviors rather than alcohol. I believe she needs to come to the conclusion that alcohol is a problem on her own.