[Tiva]

Yeah it is but it would take weeks for it to develop enough. Just when she goes in tomorrow make her take WHATEVER they give her, no matter how gross it is or if she feels better before it is done.
Also, her arm has probably not healed since her body was trying to fight off the infection not replace the bone. Until the infection is gone the white blood cells will be putting that on back order, like fighting the invaders off before they rebuild the castle. Some simple woven bone (flexible and not very strong ) over the injury and if the infection over takes her immune system it will be easy for the infection to move into.
This is mostly for your friend, letting her know what can happen if she doesn't stop the infection with medication and doesn't take it seriously. I am not an EMT or medical student, I am an anthropology student and we study bones and the damage to them.