What exactly should I do about this mold that I saw at the school?

Anonymous
A couple months ago I was subbing at the elementary school. My mom is a teacher and we were both painting the walls and doors. I saw mold in several places. I told my mom and she said she would tell the head custodian who was out that day. I just asked her and she said she never told him. She said "what mold? Where?". I sent her pictures and were I saw it. Should I leave it up to her and the head custodian to take care of it or should I call the principal or something? What should I do? I dont want the kids getting sick.
What exactly should I do about this mold that I saw at the school?
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