Has she been diagnosed as Bipolar 1 or 2 ?

Is she on any medication?

The standard strong advice to anyone on any psych Med is to not drink at all. But some people can have a drink here and there with out a problem

How was she acting prior to the Drink?

Does she has any physical problems that she takes medications for ? Not all meds play nice with each other.

How is she feeling today ? Does she remember anything about last night?