For the past three days or so my chicken has been extremely lethargic and has not been acting like her usual self. Found her in the middle of the yard the other morning after noticing she didn't make it back to the coop the night before. She has not been eating very much but has occasionally eaten the wet bread I have tried to give her. I have tried giving her a mashed up hard boiled egg and she has nibbled at it. Her poop is greenish/white and she is not egg bound. She is about 2 years old. I've posted some pictures depicting her condition. Her mouth sometimes also remains open for a few seconds then she closes it. She doesn't walk for long and when she sits down she appears to lean to one side more than the other.
What is wrong?! Any suggestions/help would be great. I am new to owning chickens and do not want to lose her. Any help would be great! Thank you