The tube feeding may give her a chance to heal. Here is a recent thread about a chicken who lost most of her beak from a dog attack, and although the pictures are graphic, she was able to save the chicken's life with tube feeding until the chicken could learn how to eat...
If you have time to devote to working with her a great deal, you might be able to tube feed her to get calories in her until she can recover. With a damaged beak, it could be cracked, but if misaligned, she may need her food in a deep sided bowl, and possibly moistened like oatmeal. With her...