I think Paul makes a valid point when he said if this was a 3-week cruise with no new passengers being loaded at the ports-of-call then the woman would have been "fully prepared". Yet merely because it was broken down into 3 segments the woman suddenly is deemed 'not fully prepared'? Why?
Let's ask another question then, if this is the way it is to be. Should cruises over a certain length require all passengers to be 're-educated' by having to attend drills again? The crew has to do periodic drills, so should the cruise lines require passengers to attend another drill every 7 days, or 10 days, etc., regardless of whether new passengers embarked? Doing a 21-night cruise? You get 3 drills. Miss one and you get the boot at the next port. That is essentially what Seabourn did here.