für die Jüngeren eignen sich vielleicht auch Hanni und Nanni oder Ostwind
I don't know about kids in the UK, but my American students (14-18) LOVE Ostwind. I can't speak for the later parts because I couldn't get them to play on my computer at school, but I know my students would have wanted to see them.
Most of my students like Nordwand, though they don't like the fact that *spoiler alert* all the climbers die. They have made me promise that everyone won't die in later films, so when they get to Ostwind and think that *spoiler alert* the horse has been slaughtered, they get upset and I say, "I said no people would die in this film; I didn't say anything about animals."
Das Wunder von Bern works well.
Some of my students liked Mostly Martha. I personally have never watched the entire film; it's not my cup of tea. I think I used it as part of an emergency sub plan after my mother passed away.
Vitus works surprisingly well for an older film, but it's mostly Swiss German, so maybe not something your daughter wants to show.
If English films set in Germany are allowed, then I would recommend Night Crossing. My students like it, and it's useful when I talk about the Berlin Wall and the division of Germany. There was a recent German remake of the movie, but I haven't shown it in class.
I could also recommend Beyond Silence. It's not as universally popular as Ostwind, but some students really like it. Once again, even though it's an older film, the students don't mind. I have to omit a few scenes for the American high school classroom, but it doesn't affect the film.
I have also used Emil und die Detektive, the remake, with a few classes.
You said that WWII films aren't necessarily going to be in the mix, but I have used Die Brücke on occasion.
I don't find that fairy tale movies work super well. The vocabulary language is more of a barrier for learners of German than a modern film with a lot of action.
I normally don't like animated versions of English films in German (Findet Nemo, Cars, König der Löwen), but my students like them precisely because they already know they like them. Also, the story is familiar, and that allows them to focus more on the language. The comfort factor shouldn't be overlooked now and then. It's maybe not what is right for a short-term appointment, but I could use them effectively as a reward for a class that is on task and getting through the curriculum efficiently. If they got ahead, they could earn a little break.
German TV can be good, too. Way back in the day my students liked Unser Charly. And more recently I showed an episode or two of the show (I've forgotten the name), where they send 6 or 8 teenagers to live by themselves in a house in Italy or Spain or whatever. I think Norbert recommended it. Anyway, my students like watching kids who are close in age to them, and the young people tackle relatively normal everyday things (shopping, cooking, goofing around with friends) that they can relate to. Also, there is a surprising amount of cultural information that comes across in them (taking public transportation, for example, which is not something my rural students do often.
P.S. Please tell your daughter to contact me if I can be of any help. I should have some free time on my hands this fall.