Hi there...I can understand your concern. The incidence of rat bite fever is very rare. Don't get too apprehensive. It would have been better if the culprit for the wound was known. Because sometimes even slightly trauma could have caused the lesion you are describing. It is good that she has taken TT vaccine. Also she antibiotics will take care any added secondary bacterial infection. maintain good hygiene of the wound. Pain can be there for few days because of the wound. If she starts developing any symptoms like fever, myalgia, red rashes especially over hand and feet, then immediately consult a general physician for further evaluation.