I have pills, but I've read some posts from @Wyorp Rock that you can give liquid antibiotics orally, it would probably be the same as any oral antibiotics. Is there a treat your hen likes that you can post some on?
I don't know the dosage though, for amoxicillin I gave 250mg orally for a week...
Were you able to give her an Epsom salt bath? What about calcium citrate. I also agree about the amoxicillin, it could help. My girl was sick for a week about three months apart, but then got better. I fed her raw yolk, black soldier larvae and nutri drench. The first time she was sick I...