First of all, it is really, really nice of you to have saved the poor girl from killing herself.
But please let me correct one thing:
i know that suicide in japan i very different from the west as it is not seen as a sin but honurable and they are "going home"
Maybe some stories and history are misleading (like
samurai's
seppuku which is known "harakiri"), but the suicide is as bad as it is in other countries, it is not honour or anything - it is a tragedy that one should take one's own life, for the person as well as the person's family, friends, etc.
People kill themselves as a way of escaping from something, to blame someone, or to demonstrate that they want to be noticed and helped... I think it is the same wherever you go. Sometimes it is not easy to find the reason but one thing is sure, the person is badly in need of help.
I do not know where the girl is now, and whether she's with her family or not, but surely people around her will try to help her. Please forget about the misinformation you've got about the suicide in Japan, if a person tried to kill oneself and failed, surely people around the person will try to prevent it and try not to let it happen again.