The examples you cite from others really isn't fair to the student I explained. Why should a student have to loose participation points or suffer detention because the schedule made up by the school puts the child in a precarious position. I understand that you have decided to not stretch the rules of your school's bathroom policy (not sure if you follow all of the schools rules and policies with such vigor), but the point that the exceptions cited are fair for this student wouldn't seem accurate to the student or the parent of the student. She didn't have a medical issue. She had a school created time constraint. Granted, in your school she would probably have to see administration and have them walk her schedule to prove her point. In our school the administration would probably support the teacher if the student had 1 minute to spare. 1 minute is not sufficient to use the restroom for girls at all times, especially if you get there and the stalls are filled. No rule lends itself to all situations. Sometime exceptions just have to be made.