It will eventually grow out. It may be very sore and tender, if she's reluctant to eat then mixing her feed in some water to make a mash will help. It will dry up and harden over a few days and then will not be so sore. As it grows out, if there are any very sharp bits that could get caught on something you may need to file those down. If you have large rocks or concrete blocks in your run, then she can do it on her own, and you may need to do nothing, but wait for it go grow out. This happens sometimes when they are trying to get something on the other side of wire, or if it gets caught on a feeder or waterer. Or in the case of cockerels, a fight.