Lemmy Lemmy:
It's not possible to willingly drink enough alcohol to get a BAC of +700 mg percent. That's a deep-coma level of alcohol and no one in deep coma is willingly taking on booze. The only way to get a BAC that high is for someone to force it down a passed-out person's throat. Check out the case Gilbert Paul Jordan.
You can get readings like that, if you area chronic alcoholic. Years and years of being pickled beyond the limits of mere mortals. Odds are, if she stops drinking cold turkey, it will kill her. If she doesn't, her liver will die if it already isn't.