My 2 cents worth, our flock had a or we think dog attack. We lost 1 hen and one with vent damage and lots of rear end feathers tore out. There was a lot of bruising on the legs and what appeared to be damage to the preening gland. She and the whole flock seemed to be in shock for several days and are still spooked at sounds and some quick movements. Now for the good part of this ...she has healed physically very well and is laying eggs again. We soaked her in a warm to medium warm water Epsom salts bath daily for the first week she was difficult to catch but she is all the better for it. She is still leary of my getting to close and was not that way prio to the attack. Chickens are amazing at how fast they heal from what seems to be a deadly injury...I'm confident your girl will be just fine.