I am very sorry for your loss. It would be good to call your state vet lab before they close today to see if they can do a necropsy on her body tomorrow. That could give you a diagnosis. Here is a list of state vets, and they might be able to email you a shipping label or you could bring in the...
How is she acting? Is she lethargic or standing around hunched up? The yellow fluid can sometimes be seen with coccidiosis. Is she drinking a lot of water?
It probably is wry neck (torticolis.) Head or neck injury is a common cause along with vitamin E or B1 thiamine deficiency, and it can be seen in some diseases. Usually it is recommended to give 400 IU of human vitamin E softgel and 1/2 tablet of super B complex orally for thiamine daily for a...
I probably would not insert a finger into her vent again as well. Let us know if she passes anything and how her droppings look. Has she passed any droppings today?
I never add a young cockerel to a flock with 2 grown roosters. I figure they could kill him. Since he has been raised alone, even the other hens will attack him until he is mature. You could try keeping him crated until he is bigger, but he might get beaten or killed. I have raised some baby...
It could be lash egg or material from salpingitis that she is trying to pass, but she also could have oviduct cancer. It is hard to tell. The blood does seem like maybe her vent was injured or pecked, but again hard to know. If she is not super weak and lethargic I would clean up her vent with...
I could see rounding the dose up to 0.1 per pound, but I think it would be dangerous to give any bird 1 ml per pound. The old dosage of 1/2 orally will treat a 4-6 pound hen. Bantams get less, and a big rooster or hen would get more. Be sure to shake the sludge out of the bottom since...
Vicks is found in most stores, and generic is much less expensive. Here is a link for it:
https://www.amerpoultryassn.com/2021/09/scaly-leg-mites/
Most people use vaseline, and Nustock cream with sulfur as it’s active ingredient in a pine oil base, works well to kill leg mites. It has to be used...
Here is a good price on Tylosin with free shipping:
https://thecanaryfinchstore.com/product/tylosin-powder-for-birds/
Dosage is 1 tsp per gallon of water for 5 days.
It could be mycoplasma (MG) especially if ahe has any eye bubbles or sunken eye appearance, but an insect sting could also be possible. MG symptoms can come and go, and can improve quickly with Tylosin in the water.
Unfortunately it does look like valgus leg deformity, and that is a permanent untreatable leg problem. Many chickens with varus or valgus may get along okay as long as they can get enough food and water.
Here is a list of state vet labs you can call on Mondays am or if you should lose another:
https://www.metzerfarms.com/poultry-labs.html?srsltid=ARcRdnpgfbEMnAZEzuzJymANTgBdvWpx5hTXrR8Wn5d9_lH4cB_lS5BN
If she had a common reproductive disorder, those may show up. Salpingitis and coelomitis/egg...
I’m sorry for your loss. If you would like to send her body to the state vet for a necropsy on Monday to find a diagnosis, the body could be kept cold on ice in a cooler wrapped in plastic bags. Some people do home necropsies as well to see if something looks obvious. You can post pictures of...
You can also use B complex for curled under toes. It contains riboflavin and the other B vitamins. Could he be pecking his legs due to the scaly leg mites and causing bruising? For leg mites a thick oil or ointment is applied to the legs to smother the leg mites. Generic Vicks from dollar stores...
That type of yellow urates can indicate severe dehydration or liver problems usually related to a reproductive disorder. Sulfa antibiotics do have side effects. Did she have the yellow poop before she started the sulfa antibiotics?
Good advice on wound care from @BlindLemonChicken I would keep an eye on the rooster, and make sure that he is not too rough on her. And that the hens do not peck at her wound.