I must agree with you, the fact that she missed the exam and failed is her fault, no one elses. Sadly, there are people who are in my program who are the same as her and miss an exam or fail by a few points, and the school has no leniency and the students fail/retake the class. I would say if she's still into the field, take the semester over and pass. to be blunt, it was a poor choice to miss the exam, and maybe that should show she should retake the semester to learn a lesson.
As far as the note goes, thats a horrible idea. The motto "don't s*** where you eat" is the best way to sum it up. If she writes the note and gets back in, the professors will be out to get her for it, and if the note doesnt get her back in, she will probably not be allowed to return to the school. Not to mention, transfering probably would be an issue since most nursing schools are in contact with each other, and that would blacklist her from the nursing programs
that talk. Maybe the note would work, and i hope it works for her. But if she has an out for the DON, she has to be prepared if things don't go her way because they can become severe for her.
And an army of people with her means nothing,, since i would guess 95% of them wouldnt speak out or say anything.