Repeat after me "not my circus, not my monkey" breathe deeply and say it again. And again, and again until you calm down and realize that this is NOT your to stress over and be upset about. If your daughter won't take any action, then you should just let it go. Really. When she graduates and has a crappy boss, are you going to sit at home and fret over it? No....so now is the time to start backing off (actually the time to start backing off is already in the past, but if you didn't start then, now is a good time to start).
Last spring, my daughter had a Monday night class. Every winter storm that semester happened on a Monday. In the first 8 weeks of class, the class was cancelled SIX times due to weather. Had the issue been a sick or lazy professor, I would have said the same thing to my daughter that I said to her for weather cancellations: "Oh well, open the book and do the work anyway, you still need to be ready to take the test"