Sexist
Not that there's anything particularly unusual about sexism in movies, particularly movies from that time. I thought I'd take a moment to mention how dismissive the male characters are of any protests she makes.
She protests her father's immoral and illegal activities. She protests O'Toole's lovemaking and then gives in, a seriously questionable signal to send to men - it's essentially rape - how can you tell a romantic giving-in from a helpless giving-in?
Bechdel Test failure. No women allies, she's a tool of a male-driven plot.
Not that women don't perpetrate the patriarchy on us, as Hepburn does here and in many of her films. Still love her. Thanks for the Bechdel-passing 'Children's Hour'.