What a lovely, very brave lady you have the privilege of knowing. It is horrible when things like this happen to people like this.
Today, here, a wonderful woman was putting the finishing touches to her spectacular 'Jubilee' flower arrangements in the church - when she slipped. She already walks only with the aid of a stick and has now smashed her shoulder. Life isn't fair. She's cheerful about it, somehow.
People like your friend and this lady give us all a clue as to how to go on.