Is this wound on the front, or the back of the bird?
It's on her crop
I'll tag in a few people who know more about crop injuries then I do.
She has a broken beak? How did that happen? Photos?
I didn't see any predator around recently except a weasel but the weasle only stole the eggs/broke them, since she shares the cage with two other hens at night and they're pretty high from the nesting box (they're hens with special needs so we keep them a bit far from the normal ones) and none of the other hens have any injury so I guess the weasle didn't come close to either of them. Nothing spills out of the wound, in fact it looks a bit old imo, and I noticed it by chance, she is quite normal, eats and flies around, doesn't appear to be in pain? I applied antibiotic on it the other day, not sure if it will help ):
I mix between hand feeding (cutting veggies into small pieces and feeding it to her myself) and tube feeding especially when she drinks water. She can eat mash on her own like if I mix seeds with mashed bread/potatoes, she actually likes it alot but she can create a mess out if it lol. Usually, I let her eat some mash on her own for a while then I'd hand feed her any veggies we have that day, I usually give her two or three types a day, and make sure she drinks some water Infront of me lol (I worry she can't drink on her own, but I still keep some water and a deep bowel of seeds in her cage at night.)
