Let me rewrite the contents of this story to fit another scenario and we can see how outrageous it sounds:

Today while at my local target, i wanted to buy some generic tylenol, but blast they were out. All they had was the name brand tylenol, which costs more. I couldn't buy any tylenol unless it was brand! dangit! Target sucks!

All the OP's daughter had to do was maybe allow 30 minutes extra at the airport to walk up to the counter to get a boarding pass, problem solved. It's not like oh hey you checked in at the airport instead of online, no precheck for you!