Ah yes there are already a lot of Studio Ghiblis on the list; definitely agree with those suggestions.
Thinking about ‘classics’ I can definitely recommend Thoroughly Modern Millie. Really funny and good. To Kill a Mockingbird wouldn’t be a bad idea either, possibly also Jean de Florette, Manon des Sources (bit of nudity though) and Cyrano de Bergerac. I watched Elephant Man about that age. Also The Scarlet Pimpernel (an awesome film). At that age I also loved Chitty Chitty Bang Bang and The Slipper and the Rose.
Was The Goonies on the 50 Films list? That should be in there, and Stardust. Possibly some early teen films like Pretty in Pink? Might be some swearing; I can’t remember. You could try some cheesy films like 10 Things I Hate About You, Never Been Kissed.
Sense & Sensibility, Emma (new better than old IMO but both good), maybe Mansfield Park (themes are a bit more grown up).
If she likes disaster movies I’d look at Dante’s Peak and Twister, as well as The Day Before Tomorrow.
Strictly Ballroom is funny and great. Splash, Ghostbusters; staples from the 80s. Some nudity in Splash though.
Check out certificates obviously; I think an 11 year old would happily watch all I’ve recommended, but there might be the odd bit of swearing or sex.