What should I do about this mold in the school?

My moms. Teacher. Last summer I went to help her paint at the school. I noticed a lot of black mold growing on the ceiling of the shelter. I told my mom, and she said she would tell the head custodian. I felt like that wouldn't be enough, so I told the principal. Well, I went to visit the school today to give my mom something, and there is still mold. What should I do?

What should I do about this mold in the school?
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