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Gallimycin is aureomycin, so that's fine - yes.
If she keeps her foot like this, she has a B vitamin deficiency. I suspect she might have issues with all her oil vitamins (except possibly D).
I'd seperate Abigael and the other hen - and keep them separate from one another.
I'd do the same treatment for both of them: Aureomycin in the water for no less than 7 days, vitamins (see below), and probiotics (also below) with VetRx swabs for the nostrils if you can get VetRx there (any kind - cat, rabbit, poultry ... or Marshal Pet Peter Rabbit Rx from the pet store).
Vitamins:
- Polyvisol without iron (baby vitamins, found in the vitamin section not baby section) 3 drops daily for the bigger bird, 2 drops for the smaller
- Vitamin E (400 to 700 IU oil capsules, vitamin sections of stores) slit end of capsule - use a dropper with withdraw 2 drops for the baby, put the rest in the bigger bird's mouth
- Probiotics (acidophilis capsules or tablets from vitamin section of store) 1/2 contents of whichever (crushed or emptied) onto food daily or in a little wet treat, or on a tiny bit of bread, or boiled egg yolk, or cooked oatmeal - whatever they'll eat.
- Vitamin B complex tablets (1/2 one crushed into powder, mixed with wet treat) daily for smaller bird.
The E vitamin helps neurological issues and inflammation (of sinuses and neuro system)
Polyvisol contains vitamin A for respiratory healing, B for walking, more E, and other vitamins to round it out. Oil vitamins are most easily dissolved from prepared feeds. D will help if the younger bird has rickets.
Acidophilis capsules: live bacteria like probios - only easier to find; for secondary diarrhea prevention d.t. respiratory drainage and antibiotics
Vitamin B = specificially to treat the inability of this chick to walk.
I'd do everything for one week, taper off the vitamins on week 2.
I'd have to ask on Oxine - it's a unique product, the only one that I believe can be misted.
Vetrx is 3.3% (v/v) alcohol U.S.P., Canada balsam, camphor, oil of origanum, oil of rosemary, corn oil.. Canada might have some other rabbit, chinchilla product that is similar. It used to be called "Save the baby"for babies so checking the children's section and adults cold remedies might also work.
I'd also watch all your other birds for symptoms - treat them all the same (minus the B vitamin) if they come down with it.