A few idea that come to mind: require her to copy a book word for word; some type of forced exercise; suspension of some activity she enjoys for a period of time; require her to watch C-Span or some similarly mind numbing program for a specific period of time and then prepare for you a detailed report on what it was about. The possibilities are endless, just about any requirement to perform some task that would not be enjoyed, superficially innocent, as a reminder of who is in charge.