Aquasol is a weaker solution and will mix with water. Because it is low dose and put in the water for 5 days, it only treats roundworms, and requires no egg withdrawal time. The Safeguard 10% fenbendazole is given orally undiluted, and will settle out in water. If given once it will only treat...
You could. Open them with a finger and a thumb and apply some Terramycin eye ointment or plain Neosporin ointment twice a day. That can help treat a secondary eye infection. If there is any gunk in the eye, you can flush with a little saline or eye ointment before applying the ointment. Betadine...
Fowl pox virus from mosquitoes lasts about 3 weeks. You could dab a little Betadine on it, but otherwise do not disturb scabs because it can spread the virus. Hold some food mixed with water and egg up to her beak twice a day, since she probably cannot see well.
Wry neck can be from a vitamin deficiency or head injury in young ones. Usual treatment is giving human vitamin E 400 IU and a 1/4 tablet or 1/4 ml of human or animal B complex daily. A bit of scrambled egg for selenium is also helpful.
What are you feeding? How long have the cockerels been gone? Are the pullets having a lot of stress and pecking order problems? They do need some access to crushed oyster shell in a separate container, as well as a layer or all flock feed.
That is the problem with fowl pox and chicks. It can cause swelling around nostril or eyes which can affect their breathing and eating/drinking. Make sure that she is getting food and is able to breathe.
It could be fowl pox, a virus from mosquitoes. It lasts about 3 weeks, and most chickens recover just fine. I have never seen the scabs in such a pattern before. In the article below, you can look at other pictures of fowl pox.
https://the-chicken-chick.com/fowl-pox-prevention-treatmen/
The splint may have been on too tight, and the tissue looks necrotic/dead on one toe. She will lose the toe for sure. Can you get a picture of both legs together?
That looks like fowl pox, a virus spread by mosquitoes, but a mild case. It clears up in a couple of weeks. Do you see any others with bumps or scabs? Below is a picture of fowl pox:
Recently it had been hard to source the amoxicillin capsules, and some use the powder in the water. Whatever you can get works. Sometimes antibiotics are not necessary with bumblefoot. Use your own judgement.
Sometimes they may get some foam or bubbles in the eye with conjunctivitis with fowl pox, but the picture in your other thread looks like possible coryza. Do you have a picture of your own hen?