Hen mysterious illness?

[severance]

Photos of hen, the odd yellow something would be helpful.

She may need to be expelling another egg or lash material.

I'd get some Calcium into her asap. Calcium Citrate+D3 would be good to give - 1 tablet right into the beak. Give once daily for at least 5 days. If you don't have this, give her a TUMS.

Video of her actions may help = upload to Youtube and provide a link.

The lunging is odd, look inside the beak for any obstruction. Some of your description sounds like neurological issues, but hard to know.

You are feeding a Gamecock Condition. Looks like a good feed to me, but it's also a loose type feed which can sometimes lead to deficiency.
Some birds tend to pick out their favorite pieces and don't eat the rest, so they are lacking. You can offer the feed soaked or fermented, this will encourage eating all of it. I'd also provide oyster shell free choice. While it does have minimum calcium, a laying hen needs supplemented.

Had you put her back with the others and this started happening or was she already separated back out. What breed is she and what breed(s) are the other hens/roosters?

I worry about the feed because we’re spending so much just for them to pick out what they want and waste the rest.

 

[Wyorp Rock]

I will send pictures. I think she’s a buff Orpington. The rooster previously was an Easter egg, the other hens are black sexlinks and barred rocks. She was isolated before this started happening.

Do I give her the whole tum??? Do I crush it up and put it in her food or feed it straight to her?

I worry about the feed because we’re spending so much just for them to pick out what they want and waste the rest.

Yes, you can give her a whole TUMS or if you wish, break it up and give her the pieces, you'll probably have to open her beak and put each piece in and let her swallow. TUMS will not dissolve in water so don't try that - been there done that!!
IF she will not take the small pieces, you can however grind up the TUMS, mix it with a bit of yogurt, something like a tablespoon of cat food or even mix it with a little coconut oil and give it to her that way.

For feed, try a pellet All Flock/Flock Raiser type feed. What you are feeding now, as a "Whole" it looks to be a good feed, but that seems to be an issue with the loose type of feed, the birds pick out what they want and leave the rest, so there's waste. No matter what type of feed you provide, do also provide oyster shell free choice for your hens so they have supplemental calcium.