Bring her inside wrap in a towel since she may be in shock. Hold her or put her in a dog crate. Let her rest. If she is still okay after an hour or two, try to get her to drink some waterby dippping her beak if you have to, and add some food. Look her over very well to make sure you are not missing any wounds or bleeding. Interneal injuries may have occurred. There's not a whole lot you can do other than supportive treatment. I had 3 pullets over a couple of months that had gotten into my yard, chased and "played with" by my dog. Two had feathers missing and made it, while the one with the lest injuries died within an hour. I hope she makes it, but they are so vulnerable at that age. I don't like shock collars, but we purchased one after the third pullet to teach him that chickens will hurt you, and he does not bother any chicken that comes into our yard now.