Hypoglycemia (low blood sugar) Support Group
The term hypoglycemia literally means "low blood sugar." Hypoglycemia can produce a variety of symptoms and effects but the principal problems arise from an inadequate supply of glucose as fuel to the brain, resulting in impairment of function. Derangements of function can range from vaguely "feeling bad" to coma and in the worst case, can be fatal.

I was married to an alcoholic, at the end before he hit bottom (when he was already my x) he was drinking all day long and eating nothing but m&ms. This is because the same circuits that feed the alcoholic brain also love sugar. Your friend got shaky after honey because it created an instant and dramatic need for more alcohol.
Re the passing out and hypoglycemia - alcohol of almost any kind turns into sugar as soon as it burns off. She is creating her own hypoglycemia by consuming almost nothing but alcohol all day long. If she doesn't stop, she could become diabetic because she is burning out her pancreas at a pretty fast pace.
I honor that you are trying to help your friend.
Does she have family that can help you get her into treatment?
She needs it badly.
(I have had bariatric surgery and have done the research...I do not drink, never did but sugar is my nemesis and if my brain had decided booze was it for me I'd be in big trouble)