Why does she look like she's got water droplets on her feathers?
Is the back of her head and comb injured too?
I would go on the assumption that an ear infection is contributing to the balance issues. Are both ears swollen? Do you see some pus inside them?
I would clean out the ears if they have gunk in them. Drop 1 drop of Peroxide in the ears and then work on getting the infection out. Put a little neosporin in the ear. Repeat cleaning out the ear daily.
Hard to know the cause of the infection whether due to respiratory disease or something else. It's possible the Penicillin might be effective, but Tylosin would be what I would use. You can order it online at the links below.
Baytril would be another option, but keep in mind that it's not approved for use in poultry.
https://www.jedds.com/shop/tylan-soluble-100-g/
https://allbirdproducts.com/products/baytril-10