I wouldn't be supportive. But then again, you don't know the results yet, so you shouldn't be too hard either. When the results are out, you shouldn't lie about your dissapointment if it is bad. Else she won't change for the better. Lets hope it all turns out for the better
Edit : Sorry I didn't read the OP properly. She did try hard, and she still made the same procedural mistakes, all those studying gone to waste. This is what she assumes to be true, so don't be too hard on her, you never know the score might turn out to be good?