I'm very sorry
Sometimes they fail to thrive, no matter what we try to do. It's sad, but does happen when we hatch chicks.
The best you can do is keep her warm, see if she will take any fluids. If you feel like she is suffering, then it's an act of kindness to put her out of her misery.

Sometimes they fail to thrive, no matter what we try to do. It's sad, but does happen when we hatch chicks.
The best you can do is keep her warm, see if she will take any fluids. If you feel like she is suffering, then it's an act of kindness to put her out of her misery.