Supportive care is key if she is going to come around. The primary concern for now is hydration - a dehydrated bird shuts down. I would isolate her in a small container within the brooder so that she is still kept warm but is protected from further harm by her more active brooder-mates. Use a small syringe, eye dropper, etc to place drops of water (electrolyte solution is best, sugar in water second but plain water will work for now too) at the top of her beak so that she can take them in - this is to avoid inadvertently drowning the little one. If she is unable/unwilling to take the water from that point you will need to decide if you are up to the challenge of more invasive treatment - such as more forceful hydration......not everyone is prepared to deal with the risk of doing more harm than good, so if that possible outcome is one that would do damage to you personally I would not advise it. Nutrition is only going to become a concern if you manage to bring her round enough with hydration. Left to her own she will continue to decline until she passes.