Showing my age a bit here, but when I think of her this film is always what I'm reminded of. That phrase "I am Miss Jean Brodie... and I am in my prime" in her frightfully posh Scottish accent rattles around my head quite a bit for some reason.
I think her character Prof. McGonagall in the Harry Potter movies drew heavily on her much earlier role as that other Scottish school teacher, Jean Brodie.
It captures the tension of social norms and rebellion and, if one pays attention, the natural consequences of unbridled enthusiasm.
Trailer: https://www.youtube.com/watch?v=CXA0N55c3iw