Rhode Island Red with large cut on leg
Separate her with food and water away from the rest. They could increase her chances of getting an infection while being around her flock.
Use this link, it is helpful for when your chickens are wounded:
So, basically, use hydrogen peroxide (we use this on our own wounds sometimes to keep it from getting infected). This is a strong way to help with prevention of infection. Good luck!
That's good! I hope she gets better in those few days. Fill me in on her health if you can!