I also am helping plan this, and I presume you will be attending. Whatever happened was presented to us organizing the conference as minor and unexpected, as her partner sent a message that she would not be able to call in for a meeting. He said that she was in a coma the day before but was optimistic, and my interpretation at the time was that she had a serious injury from which she would recover with time. I am not sure what happened - so far as I know she was in good condition in the hospital for two days before passing on the third. She was an experienced climber who loved the sport. I understand that she fell thirty feet.
As you noted she produced a tremendous amount of excellent Wikipedia content. Just weeks earlier she had gotten a dream job which was encouraging her Wikipedia collaborations, and she was also deeply invested in Wikipedia outreach to schools.
Besides her outreach to women I feel a great loss from her no longer doing outreach to LGBT communities. As hard as it is to address the gender gap with women it is even more difficult to do so with minority genders, and Adrianne was a compassionate spokesperson for LGBT interests.
yours,