I'm not sure what else you can try, I was on here 2 weeks ago trying to find any way to save one of my chicks. We did the Nutridrench, electrolytes, and probiotics. She never ate anything and she was only 2 days old when I got her so not exactly like yours.
Like you said, since all your...
Watch her and see if she is still eating, drinking, and pooping. I had a chick last year that are shavings and want feeling well. Since then I've been leaving them on a puppy pad covered with paper towels for the first week.
Is her crop emptying?