HELP! Hens beak seems to be disappearing?

[Just2relax]

I noticed that one of my hens, she's approximately a year old speckled Sussex, was missing part of her beak. It looked like it was getting worn down. I came out and checked again today and it looks worse. She doesn't seem to be acting off. She's eating and drinking normally. When I picked her up to take these photos her crop was super full.
There are three other hens but none of them seem to be suffering from this problem. Does it look like it might be a fungal issue? Something I could treat? Or should I isolate her and observe her separately?

 

[Eggcessive]

It could be that she has injured her beak on wire fencing or hardware cloth. Is she able to eat and drink normally? You may want to do some beak repair or perhaps it will grow back gradually. An avian vet might be of help, but if that is not feasible, I would read some articles about repairing a beak. I don’t have experience with that, but there are some articles about using Crazy Glue/Super Glue and an empty tea bag cut into pieces. Here are some articles and you may also find videos:
https://the-chicken-chick.com/repairing-chickens-broken-beak/

https://www.tillysnest.com/2011/12/how-to-fix-broken-beak-html/