I'm dealing with this right now,one of my roosters has sprained his leg. I just gave him an epsom salt soak(which he loves and fell asleep). Then i flipped him upside down,covered his head with a towel and wrapped his leg at sprain. For pain you can give a low dose aspirin(81mg) or a reg aspirin(325mg) dose is 25mg per lb,crush and place in water or sprinkle over feed or give orally(i gave my boy his orally,wrapped in meat or cheese). Place a towel in the bottom of cage,i have found that they have more traction than with shavings therefore less flopping around as they try and balance themselves. Keep your girl quiet and calm,encourage drinking/eating,my boy loves bananas rolled in feed/scratch,gobbles them down every time. It is not necessary to wrap leg,but i can see where swelling is so wrapping for my boy helps to keep swelling in check.