Put a small amount of neosporin on the foot, covering all the wound areas but no extra. Get her to the vet NOW. Find someone to take you, take a taxi, ask a friend, beg your parents. Call the vet you would go to and say you need to speak with the vet and explain, see what they would do for you and see what you can do in the mean time. Put neosporin on it once a day, I don't recommend the other stuff like aloe. If you could wrap her foot in something that would be good but I don't know what would be safe and actually stay. It's likely her nail got stuck and she ripped her foot away, or maybe she got bitten, or chewed it up herself because it hurt... When you go to the vet get a bottle of pain medicine (such as metacam, but if they have a better one get it) so you have it. They last 6 months and I have one just in case. We also have subq injections of pain medicine that will make them drowsy. These are for emergencies like yours where they may be in a lot of pain and there's a risk of them chewing themselves to death. Good luck... call the vet and explain and ask what they would do to her and what you can do.