A waxing mishap

Today in class a student ignored all instruction and school rules and waxed her own brows and removed about 5/6 of one brow.

After calming her down we talked about why we don’t do what she did. I do not want to make her feel bad, but need to translate this into a teachable moment for the other students (she did this after class when most other students were gone.)

How would you address this in class. There is no way students will not notice most of one of her brows is gone. I am on the fence about how to move forward with this student.