bit by dog Hen's hip bald, swollen and badly bruised, please help!

[LilyLovesBugs]

So my friend had a dog get in her coop the day before yesterday. I noticed one laying down, if she got up she limped horribly. Since my friend didn't care about her I offered to take her and try to find what's the matter with her and take care of it. That was yesterday. Today I figured out the problem, the dog bit her hip, it is badly bruised it is like turquoise blue and purple. The blue goes all the way down from her hip to the start where the hip meets the leg. There is a small lump where one of the bite holes are on the hip. I'm not sure if the lump is infected possibly. The bite marks don't look bad, I don't know how to clean them though.She acts like that leg is dead, she doesn't use it whatsoever. She is eating and drinking a ton, and her poo looks normal. She is about 48 weeks old. How do I treat this? Do you think the dog dislocated her hip and that's why she's not useing her leg? like I said one of the bite marks is swelled up, any ideas how to get it to go down?

Thank you so much!

I could really use help on this, I just don't know what to do.