I broke my shoulder about five years ago. Before I had surgery, the bones had shattered, but the surgeon was able to put in a titanium replacement. I am not sure of all of the terminology. Anyway, I had my arm in a sling for a couple of months. I got so bored that I was determined to start sewing. (I am right handed and broke my right shoulder.) I sewed with my left hand threading the needle and operating the machine. Luckily, I had some blocks already cut out before my accident. I sewed and sewed and enjoyed every minute although it was extremely tiring. I decided that some people with only one arm can sew, so I should be able to sew with one arm until my other one healed. Heal it did, some therapy, and then I was sewing as before. She should be in great shape in three or four months if she follows the doctor's orders, maybe sooner.