Yes, was visited principal office at 16:00 many times (by schedule - morning fuck with principal, during lessons punishment with Karen (and additional lessons with she) and then every day visit principal at 16:00).Have you been to the 's office at 16:00 (Karen "Wants to have fun too")
Also please post a screenshot of your "Quest Log" and your "Karen" quest.
This will help us know what you need to do.
Here is screenshots: