I think you do a good job of the teasing, but take it a little too far and I get a hint of passive agressiveness/arrogance/meanness when you get it back.
So you were both just bustin each others balls and you both knew it..... or what?
If you guys were messing w/one another I dont see any problems with the exchange. If you were just being an asshole to her and she continued the conversation then she has a very bizaare sense of self.
You can't post up an excerpt of an interaction without telling us anything else about how you e-know one another and expect us to guess what is going on.