I have one hen that is never satisfied, and always thinks "the grass is greener". We had her in our big run with her sisters, but she kept flying out. We moved her to a cage by herself, she paced like, well, like a caged animal. We moved her in with the new babies, in a bigger covered run, and she paces still. She knows where the door is, and if you even open it an inch, she's off and running!!! I don't get it, she's the only one. We did find that she prefers to lay in the tall grass (imagine hubbies surprise while mowing lawn), but overall I think she just wants out. Our space is more than adequate, so I don't think it's that, over 15sq ft per hen, we have 4 nest boxes for the 9 girls, so that shouldn't be an issue. Who knows whats in the mind of chickens LOL. Good luck with your girl!