If they are her lucky earrings & have such a sentimental meaning attached to them, surely the best thing to do would be to take them out & keep them at home where they would be safe?
Her teachers have far bigger issues (especially around the cost of living crisis) to try & help their students navigate & support this term than one student who is stamping their feet about a pair of ruddy earrings. She’ll just be asked to remove them (risking her then losing them), or be sanctioned with other penalties. Detentions, demerits, whatever her school chose to use. They won’t give a fig if they’re lucky, sentimental, or we’re personally given to her by The Pope. It doesn’t matter.
It’s a school rule, no matter how absurd, she has to suck it up. She can wear them before school, after, at the weekends. But not in school. If she wants to change the rules, join the school council.
I wore a subtle helix piercing stud as a teacher, but then I wasn’t likely to fiddle with it, lose it, take it in & out depending on if I was going into PE, science or whatever, and wouldn’t pitch a shit fit if the backing fell off which then disrupts the bloody lesson.