She certainly sounds like an alcoholic, or at least one in the making. She may not yet be addicted to alcohol, but she clearly can't hold her drink, and the alcohol takes over her thinking. This is very common in the psychology of the alcoholic.
Unfortunately, she has to see herself that she has a problem. For as long as she stays in denial, it could only get worse.
She should seek help from her doctor, who may refer her to her local Alcohol Advisory Service. If she is already an actual alcoholic (i.e. addicted to alcohol), then maybe she should contact Alcoholics Anonymous.