Reminder that in Prisoner of Azkaban, after the dementor got on the train, Harry was the only one who fainted.
Which is fair, considering he was remembering the murder of his parents for the first time ever, but also remember that at this point all he heard was screaming and got the brunt of repressed emotions.
Ginny Weasley, however, did not faint. She was a child of 12 and, only a few months prior, had been possessed by Lord Voldemort and left to die in the Chamber of Secrets.
Ginny Weasley faced the dementor, presumably was forced to relive this still terribly fresh trauma, and she held up.
Ginny Weasley is strong as hell and always has been.
Ginny Weasley appreciation life