Hen missing comb and upper beak.
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Welcome to BYC. Sorry about the hen, and I hope that you can help her. She may have been injured by a dog or other predator. Eating enough and getting plenty of water will be a challenge. Tube or crop feeding may be necessary until she can learn to eat. Feeding her layer feed that has water added to make it into an oatmenal consistancy in a deep bowl may help. Please keep us updated on how she gets along. Here is a good thread to learn about tube feeding, and another long thread about Fuzzy Bum, a hen who lost her entire beak, and survived: