Chakal said:
The other youths found maturity in taking responsibility, facing loss, enduring the heat of battle and the burden of leadership. Susan sought maturity in the outer trappings of adulthood. Big difference and quite a mistake in being useful to The Kingdom.
That's not to say one should not take pride in one's appearance and engage in good grooming. Only that she did not mature in the ways Aslan had planned for her.
Not to be sexist at all (READ THAT FIVE TIMES BEFORE POSTING A REPLY PLEAS)...not to be sexist AT ALL...but she was beginning to define herself as someone that would belong to a man someday, in accordance with the era's ideas on romance. Aslan had more planned for her. He got disappointed.
Why "not to be sexist"? The word gets bandied about these days as though i) sexism is a self-evident evil and ii) it should always have been recognised as such and iii) all of history should be retrofitted to the current world-view, all of which I'd consider highly debatable. On a reading of
That Hideous Strength, it seems as though Ransom, the eldilia and oyersi, and Lewis himself, are thoroughly comfortable with what you might call sexism; albeit a kind of sexism that is fulfilling for women as well as men. The female members of Mr Fisher-King's household don't seem distressed at not being allowed to be men.
But another problem, I think, is that Susan had fixated on romance, courtship, dressing-up, gossip and fashion, rather than what to do next. If she'd been interested in "belonging to" a man, after the customs of the place and times, then she'd have been showing an interest in settling down and becoming a homemaker (housewife, whatever) rather than just pursuing shallow, glamorous excitement; and the other female Friends of Narnia would have been a lot happier.
Let the reader mark well
Chakal's use of the words "outer trappings". That's extremely significant. Susan was willing to adopt some, and only some, of adulthood's outer trappings; as if Peter were willing to wear the crown and carry a sword and shield, but any thoughts of actually ruling Narnia with wisdom and courage never entered his head; or as if one were to agitate for the right to vote, and never bother to learn the first thing about politics. Had Susan traded childlike innocence for adult responsibility, there would be no case to answer (and not much likelihood that she would have dismissed Narnia as a children's game).
castel, it's not enough to say that Susan "made her choices" or "is living her own life". Nothing could be more probable than that she will some day have to explain to Aslan why she should have pretended that he was only a fantasy.