OMG. I have been asking, since I first heard about her drinking buddy neighbor, about if the neighbor had a boyfriend or husband or roommate.
There is a very likely scenario that keeps popping in my head. Drinking buddy is buzzed, but not smashed drunk like DB. So neighbor takes her 4 yr old home, but is worried and bothered a bit about DB being so drunk and in charge of 3 kids, especially a sick infant.
So neighbor goes home and complains to room mate / husband about the situation. Did that give the husband the idea to come and teach DB a lesson?
Did something go terribly wrong?
But now that I hear that POSSIBLY the husband was out that night, and drunk as well, and possibly fighting with wife, this scenario seems even more likely. imoo he knows that DB is passed out drunk because his wife said so. Makes him feel righteous and justified in coming over and wreaking havoc of some kind maybe.
You could well be correct about the neighbor, katydid. But in her interviews, DB had a very casual attitude about having her "grownup time' at least a couple of evenings a week. The neighbor drank outside with her that night until 10:30 when her own 4-year-old did whatever inside. That makes me think that the neighbor shared DB's attitude about the drinking and wouldn't have concerned about DB or the 3 children when she went back to her house. Of course, she could have mentioned it to someone, but I don't think it would have been out of concern.