cat food is a good source of protein and if she doesn't make it, then food for the cat.
I am almost embarrassed to say this but... LONG night at work, over tired right now, seen the post above about honey and first thought, now why the hell would you want to smear honey on your chicken? The other's would tear it apart! The it dawned on me, oh FEED her honey. Yah, time for bed.
Glad she's doing so much better, and to be honest, if she's made it this far, I think the worst of your worries is really over. If you keep the infection out, which is seems you have, the rest of it is just closing up and getting back to what will be her new normal.
I keep seeing, syringe down the beak? Is there any special way you have to do that so they don't aspirate the food?
Aaron