I already replied to your similar comment on my thread, but I’m going to repeat myself here to give this maximum visibility; vomiting does not remove alcohol from your system. You become intoxicated not when you swallow alcohol, but when the alcohol in your stomach is metabolized and enters your blood stream. If you are vomiting from alcohol, it means your body has metabolized so much alcohol that it has recognized that it is being poisoned. It is purging your stomach to prevent you from metabolizing any more poison, but it is not removing any alcohol from your system (AKA your bloodstream). Someone is just as drunk just before they threw as they were after they threw up. That person will only become sober once their liver has had time to filter the alcohol out of their system.

Since OP is not throwing up, but the girl in his story is, it is far, far more likely that she is much drunker than him. Unless he had other symptoms of alcohol poisoning (and it seems like he would have mentioned that), it is safe to assume that her BAC is much higher than his. More broadly, you should never think that someone vomiting up alcohol is a sign that they are sobering up.