She lost her leg(s) not her leg, and she lost them by fibular hemimelia. A disease that when the baby is born they do not have any fibula bones. (The lower leg bones other than the tibia). She was born with it.
When I broke my leg I didn't go out so much so my booze intake declined substantially. I also did 5 minutes exercise every waking hour, raising and moving the leg etc say a couple of hundred times...