Nothing, most likely. She probably just thought you looked or behaved in a slightly different/strange way, and that was enough to make her feel annoyed by your presence.
It happens to me all the time, my mood determines subtle changes in my behaviour and facial expression, and I can see any women around me behaving in different ways according to them. They are very friendly sometimes, but if it is a bad moment and SP comes to the surface, they immediately turn suspicious and somewhat hostile. Guys seem to be less sensitive as far as my experience goes. In most cases, they just look puzzled.
