I have a 20 week old silkie who hasn't laid yet. She starting staying in the hut three days ago. She stands on the perch, head withdrawn, almost asleep, wont eat or drink. Appears generally lethargic. Eyes are clear, no lumps, vaccinated when purchased. Crest and vent are not hard. She hasn't been that friendly since i got her but now she just stands and lets me stroke her. The other four are fine. I have read so many threads and cannot work out whats wrong?