Sorry about your chicken. Do you know if she hurt the comb and beak, or if a predator did this, or perhaps another flock member? Is ther anything sharp like fencing or a nail that she could have ripped the beak on?
Can you post any pictures? How much of her beak is gone?
Her comb should be fine, and you can use blood stop powder, styptic, or flour to get the blood to clot. Separation is good. Use a small bowl with high sides for feed, and add enough water to make it soupy. Also keep water available. Severe beak injuries can be hard to treat, but one hen a couple of years ago had her whole beak bitten off, and still has survived. The owner tube fed her for a while, and then fed her chopped egg, and since she has learned how to eat even though her beak never grew back.
