One of my 4 week old naked neck chicks were attacked by my older hen. She has a bruise on the back of her head & cannot stand up for very long. It's like she can't balance. I don't see any injuries on her leg, just her head. Hoping its not neurological & she will get better. I've separated her from the rest of the flock & am keeping her warm. She seems to still be alert but is trembling. Should I give it a few days or just put her out of her misery? I don't wanna do that if I don't need to but I also don't want to watch her suffer! Any help is appreciated!!!