My young hen stopped laying-advice please

[jen61871]

I have a approx. 8 month old Americana hen and when I first got her around 5 months she was laying. I got her with 3 other hens, had them separated for normal amount of time from the rest of the flock, then integrated them and there has been no problems. She get's along fine with the whole flock. When amongst the flock and in the bigger coop she at first was still laying and then I noticed blue eggs coming few and far between. My flock free ranges for a lot of the day so I thought maybe she was laying outside of the coop. So now for the past 3 days I have had her back in the smaller coop and yard alone with no free ranging and still no egg. Please help me out here. I don't know what to think or do. She is NOT happy not free ranging and I don't like keeping her separated from the flock. Everything about her health wise also seems to be normal-eating fine etc. There is nothing that gives me any reason as to why she is not laying.

 

[Kiki]

Chickens don't like change.
Putting her in a new place has probably caused her stress which will also slow/stop laying.

How does her poop look?
Is she eating layer feed?
Do you offer treats? If so exactly what kind and how much?