If it's still bleeding at all, you can stop it with cornstarch, styptic powder, or even spider webs. They can really bleed quite a bit. It looks, however, from the picture, that it might have already stopped? It's a good idea to clean it so that the others won't be attracted to the blood. Other than that, it will heal fine and will grow a new nail in no time.
Thanks! I hope the blood dried and stopped. I saw some blood on her neck yesterday and I assumed it was because she scratched with that foot. Thankfully she hasn't gotten pecked at yet! I'll check to see if she opened the wound again when I let them out and maybe clean it.