Earlier today we found one of our girls hiding in the corner, straining and sounding very Raspy. My husband brought her inside and cleaned out her sinuses and cleaned her up, where he then found a bubble of air under her skin up by her neck. Even after cleaning out her sinuses, she is still very Raspy and breathing out her mouth. She sounds horrible. We have separated her from our flock in case it is something contagious, but we aren't sure what to do from here. Is there anything we can do to help her? Is it worth trying to fix, or should we put her out of her misery?