Getting extremely skinny hen to gain weight

[Riverbend Farms]

1) What type of bird , age and weight: She is a 6 year old barred rock hen, she is emaciated and BCS of 1. She is 4 lbs (but always has been on the leaner side). Her keel is very sharp.
2) What is the behavior, exactly: She just is a little slower than the other birds but she does forage with them and goes with them, she doesn't isolate herself. She does get quite cold in the mornings (I assume from being rail-thin) and puffs up, but then once it warms up she moves around more normally.
3) How long has the bird been exhibiting symptoms: about 6-8 weeks.
4) Are other birds exhibiting the same symptoms? No I have another 6 yr who is doing just great.
5) Is there any bleeding, injury, broken bones or other sign of trauma: No
6) What happened, if anything that you know of, that may have caused the situation: I have no idea, this kind of began mid January/late January. After she molted her comb just never got big again.
7) What has the bird been eating and drinking, if at all: She eats and drinks on her own. Even when puffed up in the morning if I throw treats into the chicken yard she'll dash to them to eat quickly before the other birds. She just doesn't eat enough and her crop is never full, usually flat even before going to sleep.
8) How does the poop look? Normal? Bloody? Runny? Last time I looked at her poop it was normal consistency and color.
9) What has been the treatment you have administered so far? I dewormed her with safeguard a few weeks ago.
10 ) What is your intent as far as treatment? For example, do you want to treat completely yourself, or do you need help in stabilizing the bird til you can get to a vet? I would prefer to treat her myself, as I think the only thing I can really do is get her to gain weight, because I doubt there's a whole lot a vet can do.
11) If you have a picture of the wound or condition, please post it. It may help: Not really any photos because her only real issue is being very skinny.
12) Describe the housing/bedding in use. She free-ranges then at night goes into a coop (with no drafts).
Essentially, I need her to gain weight. But the issue is she'll eat like 10 bites then wander off. But if I grab her again she'll eat more, just never enough. I don't thinks its cancer or anything because shes been like this for like 6-8 weeks.

 

[Wyorp Rock]

She's eating/drinking and moving about, free ranging.

I'd provide her with her normal feed, check her crop to make sure its emptying overnight and periodically check for lice/mites.


You're other thread. Again, at 6yrs of age, sometimes they do slow down, she's not laying I assume, so she may have something reproductive going on or its just age that's taking its tole.

I'd leave her to her own devices and let her chicken and enjoy life the way that chickens do.

Here's your other thread, the information and suggestions I would have for you today is the same as it was a month ago.
https://www.backyardchickens.com/threads/emergency-emaciated-hen.1684783/#post-29048350

She's 6 years old, you don't mention if she's laying eggs or not. I would assume not. As hens get older, often they can start to have reproductive issues like EYP, Internal Laying, Salpingitis, Cancer, etc. and/or other conditions like organ dysfunction.

I'd encourage her to eat her normal feed, see that she's drinking well. Check to make sure her crop is emptying overnight, look her over for lice/mites and deworm.

If she's able to eat/drink on her own and can still interact/forage with her flock without being picked on, I'd put her with her flock and monitor her from there. She'll be more comfortable with the flock then isolated in a crate all day.

understand your concern about her being underweight. She did not lose all in one day and won't gain in one day.

Again, I'd encourage her to eat her normal feed, you can offer it wet or dry.
Oatmeal really has no nutritional value for a sick bird, I'd omit that completely. Egg, fish, meat can be offered as small treats, these are extra protein and have essential vitamins and nutrients in them. Mealworms are high in fat, so only a few of those a couple of times week. You don't want her to gain fat which can cause liver and kidney issues.
Normal feed, a treat a few times a week. No "calorie gels" whatever those are.