Few things in law are certain. Even fewer things in life are certain. In fact, it is said that only two things in life are certain: death and taxes. Allow me to submit that there is one more thing in life of which you can be certain: your mother is, was, and will be correct.
Among the myriad things about which your mother was correct is the fact that if you were too sick to go to school, then you were too sick to go out and play once your friends got home from school.
I raise this tautology, actually a repetition of an argument that I made in paper that I authored in 2010 titled Sick of Work? The Legal Minefield of Workplace Burnout, in respect of the case of McLeod v. 1274458 Ontario Inc., 2017 ONSC 4073, which held that working notice was inappropriate for an employee absent from work on medical leave.