Poultry Cell can be given orally 1 ml for each 3 pounds of weight without dilution. What does your label say for the B12? If you tube feed, you would need to follow with a little water to flush the tube. How much tube feeding are you giving, and is she not eating on her own?
Both labels say 1ml to 3ml daily.
She had a bunch of issues and had stopped eating. I began tube feeding thinking it was palliative but she recovered from everything except weakness in her legs, and she hasn't been eating. She drinks water now (she didn't for a while)
She was paralyzed for a week, now she can 'pedal' with her legs, but she isn't trying to stand. I pick her up several times a day, she flopps with her wings and legs, but there isn't much strength. I tried duck egg yolks, but she digests chicken yolks better. I tried baby parrot powder dissolved per their instructions. Initially I tried yoghurt. I tried chick feed ground up with a coffee grinder, soaked it, then through a sieve to get the soup texture for the tube.
The original issue was peritonitis, which I thought would be fatal, but she somehow recovered.
She isn't in pain, (but she is profoundly irked at her state).
I chatted with someone here who had a hen go lame (Polish) and it took 3 days of poultry cell to get her up. (She had been on nutri-drench to no effect.
I put both b-12 and poultry cell (2ml each) into the syringe with water to make 10ml and gave it to her.