The most natural and grammatically correct way to complete the sentence is:
She is late on school days.
This uses the simple present tense, which is appropriate for a habitual action or a general truth.
اذا كان لديك إجابة افضل او هناك خطأ في الإجابة علي سؤال She ______ late on school days اترك تعليق فورآ.
