She wasn’t greyed out, but still had the icons over her and when I hovered over, it said “at school,” but I was still able to go into her inventory. I’ll have to try moving them out and back next time. I just ended up aging her to a young adult and moving her out to do another one tile challenge. I didn’t have a GUI at all, but I’ve had that one described in that post in my other save, which has also been buggy. It was also the season premiere holiday so I had that GUI, but the high school one didn’t show. Sim was still going to classes. I only had the one teen.