It may not have seemed like a huge deal at the time but I do hope that one takeaway for the OP is that having a high school student operate on 3 hours a night sleep over a multiple week period is a bad idea. I would take care that not only this D but any other children that go through the school (or any school) get sufficient sleep each night. If it means having a child dropping down a level of difficulty in a course (if it is possible at that HS) or even hiring a tutor as it seems many in the school seem to do then that is the cost of attending that institution.
Best wishes to the OP and her D moving forward.