What should I do if I think my girlfriend is wrong?
Why do you think your girlfriend is wrong?
She makes me angry when she is drunk and she thinks she's right.
It's okay to point out the wrongs of people. Especially when they are drunk and don't know what they are doing.
She's just going to say I told you so.
It doesn't matter what she says, as long as you attempt to point out how she shouldn't be drinking so much. It shows that you care and that is all that matters.