I do not have HBO, so thanks for talking about the highlights. I cannot comment on the show but I can add:
If she was a closet alcoholic, a .19% (190 mg/dl) is not unusual, nor that high.
I used to work in a DUI processing center. We would get alcoholics in for a blood draw at 9am, after not drinking since they went to bed. They would wake UP with a 100mg/dl level and appear perfectly fine and function through their day. Functional Alcoholics is the term we used. They were priests, lawyers, warehouse workers, every walk of life.
I have seen alcohol levels of 600-800 mg/dl and the people are walking talking and far from being in acute medical distress. Yes, they were drunk and you knew it, but you would never, ever guess the level was that high.
We used to have a game of "guess the level" when they came in, and like the Price is Right you had to be the closest without going over. Sick, maybe, but it passed the time.
An alcoholics mind and liver does not process like a normal persons. Has the autopsy report been released? Do we know if there was chronic liver damage?
I would be VERY interested to know how much she drank the night prior.