Hi there, it looks to me like she is losing the last of her baby feathers, but it's hard to tell in the photos. If that is the case, she will regrow her feathers once she has molted (usually late fall or early winter) and new feathers will come in. You can protect her bare spots with Durvet NuStock (not sure where you are located, I provided a USA Amazon link:
https://www.amazon.com/Durvet-3-Pack-Nu-Stock-Ointment/dp/B0071D0T2S)
The NuStock will also help her skin heal and will prevent her from picking/plucking the feathers. If you can't get NuStock, you can also try Rooster Booster Pick-No-More (
https://www.amazon.com/Rooster-Boos...+no+pick&qid=1600690655&s=pet-supplies&sr=1-2)
Or sometimes plain Vaseline will work too.
If the feather loss is caused by mites/lices/parasites, you will have to inspect her at night after they go into the coop. Mites/lice/parasites feed at night time, they will be on your chicken's skin, around the vent area, and will be very, very small. You will need a good flashlight and possibly a magnifying glass. Part the feathers and look on the skin (for mites) and at the base of the feathers (for lice). There are some good threads on BYC on how to inspect for mites/lice/parasites!
Other causes of feather loss might be:
1. Poor nutrition - I'm assuming you're feeding them the appropriate all-around good feed (I use Purina Flock Raiser for my mixed age flock).
2. Bullying - Is she getting picked on by other hens? Do you have a rooster that might be aggressive with her?
3. Lack of calcium - sometimes hens will pluck and eat their own feathers due to a lack of calcium (oyster shell), I'm assuming you're providing free-choice oyster shell.
How is she doing today?
. If she did have lice (or mites), they quite literally can suck the life out of a hen. You’ll need to inspects every hen in your flock for the same thing. DE won’t work against mites/lice, you will have to completely and thoroughly clean every nook and crannie of your coop and spray with Permethrin (or th equivalent in Jordan) and also spray each bird with a diluted solution of Permethrin (diluted according to package instructions, very important to dilute or else you can give the birds chemical burns). That’s really the only way to get rid of the mites/lice, which are most likely on your other birds too. I just had one of my beloved hens get killed by mites, so I just went through this myself.
