I quit 50 days ago. WASH YOUR HANDS!
If she doesn't get nutrition she will die.I have contacted them and they really don't know much about chickens. They sent me to this website to see what you all had to say.
The vet should be able to teach you how to tube feed her but I'm afraid it's just too late.
I highly recommend getting a necropsy so you know, for sure, what the problem is.
Are you in the US?