Great suggestions here. I would agree with Went the Day Well, and add This Land is Mine, starring Charles Laughton. The propaganda films of the second world war have a real sense of the fear and determination of the people faced with the threat of Nazi invasion.
If she’s a patient eight year old, you might try The Great Dictator; Chaplin’s greatest film, imo. There are some passages a child would love, of humour and pathos and excitement, but it is a slow film in places. The representation of Hitler is just superb, though. Apparently, the little bastard watched it several times. That’s vanity: watching a genius apply his talent to ripping the shit out of you.
PS, I totally agree with rustyspammer above, about The Silver Sword.