Zarfkitty,
That stinks! It will be a long night......for both of you.
My DD10, also in a highly gifted magnet, which does not post grades/assignments on line, but does give long term assignments with a future due date and expects the kids to manage it.
They give them Daily Assignment Notebooks and they are supposed to keep track of all of it there. We've had some long nights, too.
I finally told DD I wouldn't do it anymore, she was responsible and I could give a rat's behind if she flunked out. She knows this is not an empty threat because I would truly prefer to homeschool her. Problem solved. However, she is a teacher pleaser to the max. This approach would totally backfire with my youngest, whom I totally expect to be homeschooling at some point in the future, lol.
