I would think she was a case of failure to thrive but if she eats well and drinks, I am not sure what is going on. I hope she does well. Maybe you could get her some bantum friends.
I'm asking about the pet quality silky on the left. He or she? He or she is 20 weeks old. I have never seen it try to mate my hens. Never heard it crow but still am on the fence about this one's gender.
I love my red stars. They are great layers. I have heard black austrolopes are great for egg production and hope to add a few to my flock this coming spring.
At 3 months old I believe your chickens are old enough to have scratch but I have always heard not to give them to much scratch in the summer because it can cause your chickens to over heat.
How many chicks will you be getting? If you are just getting a few this should work ok. I would be concerned more about the chicks being to hot than to cold with the lamp right on top like that.