strange isn't it how she took this girl under her wing and obviously had big expectations for her then all of a sudden the girl is 'found' out and your wife takes the girl home to her mother
maybe the fact that she feels let down by someone (other than you) makes her realise just what kind of husband she truly could lose if she was not careful
I think I recall that she has also gone out with 'loser' types previously and believed she was in love with them
sometimes it takes someone else to screw up - for us to look at our own life and see how lucky we are
you have stuck by her through thick and thin you have kept up you support and turned yourself around she is also beginning to change
bet she is just beginning to realise that she is lucky to have you after all
don't have any big 'professional type' insight here just thinking she may be remembering her own life at 17 and when comparing where she may have been with the reality of where she is - oh well you get the picture