Hindsight!
It seems to me that with hindsight perhaps this lady might have tried the emergency call button to contact the FD before deciding to evacuate. I think it would be churlish however to criticise her with the benefit of hindsight.
I'm sure that evacuation is not something she undertook lightly but knowing how fast a fire can spread in an aircraft cabin I don't think anyone can really criticise her for being proactive in getting pax off.
Having been in one or two incidents myself (as flight-deck) I know how easy it is to find your actions questioned after the event by somebody in the calm of an air conditioned office!
DP