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I think you missed this part above.
She is still on Student visa and it expires on 20th of March while her exams ends on 27th March 2019.
Kam

I didn't miss anything. Go have a look at the OWP form, IMM5710. It's called Application to Change Conditions, Extend my Stay or Remain in Canada as a Worker.

She had status as a student and applied to change her status to a worker. Her study permit is no longer valid and she is studying illegally.
 
Oh really..i did not know that.can you advise way forward?
Kam

It is stated in the guide.

Can my spouse or partner study in Canada?
If your spouse or common-law partner already has a study permit and wants to keep their temporary resident status as a student, they may submit an Application to Change Conditions, Extend my Stay or Remain in Canada as a Student form [IMM 5709] (PDF, 488.83KB).


She can apply to change her status back to student. Any studying done in the meantime will still be illegal.
 
In my case,I am sponsoring my wife and we applied for OWP and PR together while she is on student visa.