Your OP showed frustration with both the process of not being allowed to register earlier and with the result. Students know to be prepared to register at their assigned time to have the best chance of getting the classes they want. Waiting a couple of hours can be the difference between registering with other fourth-years or with third-years as well. Its still not clear to me that you knew your daughter’s specific registration time.
I agree your result is frustrating, but not entirely surprising when one is trying to register for upper level, smaller seminars, particularly in some fields such as political science which are notoriously difficult to get without contacting the professors. I agree that contacting several will improve your chances of finding a class she wants.