My girlfriend owns a Confederate flag but she says she's just really into the civil war.

My(24M) girlfriend(24F) and I have been dating for a month and a half. About a week ago, I went to her place for the first time. It seemed a perfectly normal apartment and all, but when we went into her room her closet door was open and she has a Confederate flag hanging in her closet.

Now, she's never given me any reason to think she's a racist or bigoted or anything like that but I suppose she also hasn't given me any particular reason to think that she isn't. When I asked her about the flag, she said she's really into history and the civil war is her main topic. She did also have a bachelor's in history hanging up in her room so that seemed legit.

But since then I've asked a couple of my friends who were into history (one of which is going to college for it) if they would ever own something like that and they both said they thought it was weird.

Am I over thinking this? Is my girlfriend a racist or does she just like history? Owning a medal from Nazi Germany doesn't make you a Nazi but why would somebody want something that symbolizes oppression? Is it just a history buff thing?