Sadly, she only gave birth to one. I decided that was a bit of a disappointment and reloaded the game to have twins. I'm not sure what caused the glitch, but it certainly made me laugh.
There should be no problem teleporting them back. Nothing happens on aging until you take teens out of the sim bin. If by chance you did move a sim in that you wanted to use CMP on, you could teleport him or her back also and continue on.
For the record, I tried it both ways. I teleported an unaged teen sim back from the bin with no problems, as well as a YA sim already living in a house on campus. Both are progressing normally and nothing has imploded yet. *knock wood*
I wish I knew about this mod two days ago. I haven't moved them into a dorm, so they haven't aged to young adult yet. Is it too late to use a teleporter to pull them back from the Uni bin and use this, or will something implode?