You do realize your blood alcohol level isn't going to continue to drop after you're dead right??<quoted text>
I do not know if you could necessarily say she was being responsible. Her BAC was 0.164% at least 12 hours later when she was found dead. I am not sure the exact equation but I am willing to bet a lot of money that level was much much higher when she left the bar. Drinking that much is hardly responsible. Despite all of that she still has 2 children that must live with this terrible event for the rest of their lives.
She was FOUND 12 hours later. Doesn't mean she died 12 hours later. She could have died 12 hours before and therefore her BAC was .164% AT THE TIME of death.
FYI: Death has a nasty tendency to cause internal organs to stop working