I have two teens, one is born into the family the other is his imaginary friend who became a real Sim when they where children, now I enrolled them both to the same boarding school, he left just fine. But she was never picked up. Now it says "enrolled in boarding school" on her but she isn't grayed out. I called him home to re-enroll them both. Well I couldn't take her out of school. Still says "enrolled in boarding school" I still have control over her when it comes to things like eating, sleeping, talking to people and such but she can't go to school, she can't get a job.
I could of course age her up, but wanted her to be a teen for a bit longer!