I think I've only ever spied her once in my game. But that was quite some time ago. Never seen her since. If you stumble upon her, I believe the only way she will attend HS, is to play her. I have discovered by having more than one household in the game, that the ones I'm not currently playing don't go to school. This didn't change with HSY, sadly.
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good data
I forgot that detail to ask (I have not HSY)
Teens out of world, can go to Copperdale High School?
http://www.getfreeebooks.com/star-trek-original-series-fan-fiction-trilogy/
I've never seen Baby Ariel there so far and I've played a fair amount of high school.