The men drink beer and the women drink tea. But she drank beer.?

An afternoon family get-together party was arranged for our dear old relative Stuart Green. The men being allowed to drink beer or tea and the women being allowed to drink tea. However, Jill, 23, my niece, asked for beer. There was a confronting moment as everyone went quiet. It was a very difficult and dead silence. However, it didn't deter her from boldly going against our family get-together preferences on beverage choices. I would like to see her on the weekend to have a gentle chat on her conduct. How should I engage and help a young lady like her?