Depends on the organisation. Some are quite structured. I am recruiting at the moment, and the application is assessed on the essential criteria which gets candidates to interview and possibly also some kind of assessment. Then the slate is wiped clean and the selection is made on the results of interview/assessment.
I have also recruited for another organisation where candidates were marked on their application, their interview and their presentation, and the combined score used.
You do try to calm people down who are nervous, but at the end of the day you can only rate people on what you observe, and if they don’t present the evidence then…
Sounds like she did fine to me ! Everybody is nervous. Make sure she gets feedback if she doesn’t get it – sometimes that can be surprising, always that can be useful.