j:
Relationships evolve as we learn more about each other. Even though a given relationship may have been in existence for a long time, new information may require reevaluation and adjustment. Inadvertently you touched a hot button and got the knee-jerk response. I say knee-jerk because it could be that it took her by surprise with no time to process or it could be an accurate reflection of her thinking. It may be too early to tell. I'd say let it steep for a few days and have a low-key conversation about it.
DeeAnn