The part of her nervous system that was producing this reaction was the "sympathetic nervous system."
The sympathetic nervous system (SNS) is a piece of the autonomic nervous system (ANS), which additionally incorporates the parasympathetic nervous system (PNS).
The sympathetic nervous system enacts what is frequently named the battle or flight reaction.
Like different parts of the nervous system, the thoughtful nervous system works through a progression of interconnected neurons.