Daughter not peeing in school

I just listened to the episode about Meri not peeing on Sisterwives or whatever it was. But you mentioned your daughter goes all day in school without using the bathroom and my 13 year old is the same! I do not get why but she will go the entire day without going. It worries me. The only thing I can think of is when she was younger the hand dryers and loud flushes scared her. So maybe it’s a lingering fear?? Idk, I’m just glad we’re not the only ones who are experiencing this.