HI, I have one 4 year old BO hen who laid a strange egg within another leathery egg about a week ago. Since then, she has been weak, little appetite, runny poop, sleeps a lot, and her comb is droopy and dark reddish. She vomited clearish liquid so I thought it might be sour crop. I have isolated her inside from the rest of my birds and have given her probiotics/electrolytes and Wazine 17. She does not seem to be improving much. Feed Supply store recommended oxytetracycline but after doing my own research, I thought maybe Corvid would be better. Her crop is smaller now but still squishy and she has little interest in food. Would anyone have any advice for me? Thank you.