Lots of good stuff here! I always believe that honesty is the best policy, but when you are dealing with "edu-crats" you never know what is best. Some may point to the Student Handbook and others like some have said may take a keen interest in DD's extra curricular activities and look the other way.
She just might end up having an extremely unusual case of a normal temperature! I might even have a thermometer that is out of calibration.
I used to get crap all the time from my DD's High School about her missing class for showcases and the coach used to punish her for missing practice for ongoing Physical Therapy after her surgery. Now 2 years after graduation they post about her accomplishments as if they were fans all along.