I got into an accident and I request my employer for one week off from work and she fired me

That is a blatant violation of your rights under the Ontario Human Rights Code. In addition to the severance that you are entitled to (use our Severance Pay Calculator at http://www.severancepaycalculator.com to find out how much you are owed), you may also be entitled to additional damages for the way in which you were treated. Give us a call at the number below to set up a confidential consultation with one of our lawyers.