Bec wrote:
Her parents have been nagging her about her younger sister. They sort of seem to make her resposible for her sister. When my acquaintance was explaining what her sister's problems and difficulties were, I realised that it sounded a lot like AS (she actually didn't know what AS was). So she asked me for advice. I told her about AS.
She went to the right person, I guess!
An unofficial diagnosis is really almost as good as an official one. If she clearly has AS, you should tell her and explain the symptoms. As long as she knows why she's different, things ought to be a lot easier. And for the parents, there really isn't much you can do. If they really love their daughter they'll do what needs to be done.