Is it a front leg?  Are you sure it is a fracture? Apparently there is some disease that kittens sometimes get that makes them limp on a front leg and they need a particular treatment-- I am not sure if it is an antibiotic.  The woman who runs the shelter where my cats came from mentioned to me the other day that she euthanized a few kittens for this problem years ago before finding out it was a treatable condition.  I thought you had known she injured herself. 
Michelle

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