Man, a FA can't get much love here, huh? I wasn't there, so I have no way to know, and hopefully without sounding curt, I have to wonder if the assessment that the FA was shell-shocked is accurate. I wonder this because the survivor reports sound like they were somewhat fearful fliers in a somewhat (if not very) panicked in a situation they never expected to be in, while the FA has presumably had extensive training for this kind of situation.
I would imagine that in pretty much every situation (the WN in LGA comes to mind) the passengers escaping the plane reported that they wished the FAs had done the evacuation more hurriedly.