My gf always has to be right. Even if I show her that factually she's wrong she still gives an excuse as to why she's right. I'm getting tired of this. Is there some way to explain to her what she's doing?
All you can do is present the facts, as you have done. Explain to her that you have no problem with disagreeing with opinions of the facts, but there's nothing to discuss if there are "two sets" of facts. This is a big red flag for you future. If she persists, you'll have to make a choice.