I am not sure how bad the wounds are. I would be worried that the other hens might peck at the bleeding area(s), especially since she's at the bottom of the pecking order. If you could separate her, I would.
I would clean the wound(s). Mouths are dirty. For my hawk attack, I used an iodine solution. I also used Blu-Kote (germicide and fungicide) after I cleaned the wounds. In between the cleaning, I would put some Neosporin (WITHOUT pain relief - that's poisonous to chickens) between the cleaning. I also put antibiotics in Snow's water but her wounds were very bad and she did require surgery. It really depends on how bad the wounds are.
I am not sure about the leg. I'm sorry.
Now, I had one get attacked by a dog before, but I got the dog off quickly and there was no wounds at all. I didn't remove her from the flock because she was just shocked but had not bleeding wounds or other injuries. The bleeding worries me because the other chickens might be drawn to it and make it worse....
I don't know if this is the right thing to do. It's just my opinion so hopefully someone with more experience and knowledge will chime in!!!
Good Luck!