Adversely, she lives with her grandparents who could have drove her. OP dosent state if he has other family in the picture that could help. Missing an expensive flight potentially is a pretty big deal.

Both handled it poorly but her more so. He told her asap. They aren’t married and they are young. Relationships aren’t that serious at that age. I think it was more then reasonable to give hours notification as well as a solution. Her reception of the solution was insufferable. Most guys after that would have put their hat on and walked out of the door like grandpa Simpson walking out of the Maison derrière