Alcohol causing angry behavior and forgetfulness?

I am not an alcohol drinker and I dislike alcohol fully.

My female friend becomes extremely angry and wild when she mixes beer with absolut vodka. She blames the alcohol and I am here to ask if this is true.

She will fight and become extremely difficult to deal with and will reach a point where she will throw punches. She will also say she won’t remember any of her acts.

The 1000000 dollar question is : is alcohol causing her to go crazy or is she faking her behavior ? And also forgetful of her craziness?