How often do people call out where you work?

So I'm a teacher but I live with two ECE teachers-- I've noticed one of my roommates kinda calls out a lot which is annoying because I like having my apartment to myself when I work from home but it is what it is. I know she has some mental health stuff going and is also in grad school so she really struggles with having multiple jobs and time management stuff so she often calls out. Recently she told me she is quitting her school because they aren't approving enough time off for her. As someone who used to work in schools the call out would really bother me because I'd have to cover for said teacher ALL THE TIME. I understand if she has mental health stuff going on but I don't think it's fair to be calling out all the time either and she also said it's a bit of a school wide problem. I'm wondering if it's an issue at your school too.