Well shes 18 where is she getting all this alcohol ? Yeah I know kids always find a way if they want too.

She could have any number of problems to be honest. But no way to determine it by a Pdoc until she is Sober. It is really upsetting to anyone that has Bipolar to hear someone just blame there behavior on " Bipolar".

Based on what info you gave us I would say Alcohol dependant and BPD or just a plain spoiled child that has been "allowed" to act this way and get away with it.

What a mess I'm sorry your have this person to deal with.