Disability discrimination and retaliation

Plaintiff was employed in one of the defendant’s stores.  She suffered a back injury and filed a workers’ compensation claim. When she was partially recovered, she returned to the store on a light-duty assignment that allowed her to work four hours per day.  Upon her return, co-workers made fun of her injury and mocked her limitations, sometimes implying by their barbs that the injury was faked.  The plaintiff sued for disability discrimination and retaliation. Does she have a good case? Explain your answer.