It's too late for a vet to do anything for the beak. She and her others hens were probably debeaked as chicks. It's an extremely painful and cruel operation where the beak is electrically burned off and the blood vessels cauterized. The beak will never be able to grow back.
She is likely in no pain from it now, but she will have a difficult time eating anything but moist food.
If they debeaked the birds wouldn’t her other hen be the same way?
Since it’s your family’s business, can you ask if she was debeaked?
I didn’t think anyplace in the US still did that

....
Thank you I really appreciate the help. I don't think people realize how much I've fell in love with my hens. I spend a lot of time with them outside and we search for bugs and worms whatever we can find
I think that most everyone here knows
exactly how you feel about your hens. They can be very special, and you can form just as real an attachment to them as you would to a furry pet.
I wonder if she’d eat a worm if you held it in front of her— sort of dangling there... I think she’d have better luck that way because the bottom half of her beak won’t get in the way if the worm is hanging. For that matter you could feed her slivers of fruit in the same way, held out in front of her.... I just don’t know if you can realistically hand feed her enough to keep her healthy. If she’ll eat any of the moist, softened crumbles, then you’d just be hand feeding what she’d normally be foraging for...
All the talking she does to you is probably her way of trying to tell you that she knows something is wrong and she can’t eat the way she wants to. She probably
is hungry... but only you can tell if it seems like she’s losing weight... does she feel lighter or skinnier?
Do you know what they were feeding her before you got her? Because like you said, she wouldn’t have survived this long if she couldn’t eat at all. Unless this injury isn’t as old as everyone thinks.
Oh yeah, and welcome to BYC!
