If I was hurt on the job but can continue working but was told by the doctor I couldn't lift more than 50 pounds, can I get fired?

My friend was hurt lifting boxes at work over 50 pounds. She tore an old injury and was told by her doctor not to lift over 50 pounds above her shoulder. After informing her employer and giving them the recommendation from her doctor, they sent her home and took her off the schedule saying they would contact her in a few days with a decision. I personally have worked in management and cannot see any reason to fire her in this case let alone take her off the schedule at all.