Ah well, I meant by school: if she got any exams/tests, maybe she is behind and got lot of work to do etc or school doens't want go give her 4 weeks off. For other Dutch models that was frequently a reason not to dol all even when they were already 16 (also lot of them got excl.)
I can't tell about other countries cause I don't know, so that why I say Dutch Models. However in the next fashionweek there is a one week vacation in Holland (during London and Milan fashionweek), so maybe unless she got a excl. indeed.