If She thinks it's an argument, then it's an argument. How do you tell?? I don't know... I think it has to do with how emotionally she's involved with the subject at hand. If she feels really strongly one way and you contradict that, then that's gotta be an argument. The relationship is new, so you probably don't know her tells yet, you've gotta watch her closely to see if she's just discussing or if she's upset out it. Once you know her better, and what she stands firmly on, then you'll have a much better idea of whether you're having an argument or just a discussion. When all else fails though, just ask.