In normal conditions, there's really only three things that can cause someone to "fall overboard"; homicide, suicide or dangerous/reckless behavior. Alcohol or drugs can increase chances of any of these unfortunate incidents but it's not required. Suicide, homicide and avoidable deaths happen on dry land daily without alcohol or drugs being a contributing factor.
I agree these stories can be scary, especially for people who have not cruised before. Even if they don't release what happened to this particular woman, it would be nice if they would include facts about how impossible it is to simply "fall off" a ship without intent or extreme recklessness.
They have reported that it looks like she climbed the railing and fell backwards into the Gulf of Mexico. So stupid.