Can you try to take her to a vet? I would try to clean as many of her wounds as you can. It can be a chore to get enough food into her, but soft foods such as chicken feed mixed with water, canned cat food, baby food, and KayTee baby bird feed would be good.
Can you get some pics of her beak inside and out? With her scabs, you can clean them with a little 1/2 strength Hibiclens (chlorhexidene,) spray them with Vetericyn or a similar hydrogel wound spray, clean with mild soap and water, and then apply plain Neosporin or Triple Antibiotic Ointment...