Sometimes I think that I might doubt my girlfriend's "intolerances"
Why do you doubt her intolerances?
She claims she has intolerance to alcohol, but she was drunk all the time
It is okay to doubt your girlfriend if you see her consume things she has an intolerance of over and over again. It would be good to question her when she is sober.
What? I don't want to interrogate her, I just want her to take responsibility for her actions.
Well then you should speak to her about it, and see if she will admit to things? You've said you have personally seen things that prove her wrong, so let her know? It doesn't have to be an interrogation to get some answers.